Abdalla, F. H., & Roberts, E. H. (1968). Effects of temperature, moisture, and oxygen on the induction of chromosome damage in seeds of barley, broad beans, and peas during storage. Annals of Botany, New Series, 32,119-36. Aison, S., Johnson, M. K., & Harger, T. R. (1984). Role of birds in dispersal of itchgrass

(Rottboellia exaltata (L.) L.f.) seeds in the southeastern USA. Protection Ecology, 6, 307-13.

Akanda, R. U., Mullahey, J. J., & Shilling, D. G. (1996). Environmental factors affecting germination of tropical soda apple (Solanum viarum). Weed Science, 44,570-4. Alkamper, J. (1976). Influence of weed infestation on effect of fertilizer dressings.

Pflanzenshutz-Nachrichten Bayer, 29,191-235. Andrews, R. E., & Newman, E. I. (1970). Root density and competition for nutrients.

Oecologia Plantarum, 5,319-34. Ascencio, J., & Lazo, J. V. (1997). Growth evaluation during the vegetative phase of dicotyledonous weeds and under phosphorus deficiency. Journal of Plant Nutrition, 20,27-45.

Baker, H. G. (1965). Characteristics and modes of origin of weeds. In The Genetics of

Colonizing Species, ed. H. G. Baker, & G. L. Stebbins, pp. 147-68. New York: Academic Press.

Bakker, D. (1960). A comparative life-history study of Cirsium arvense (L.) Scop. and Tussilago farfara L., the most troublesome weeds in the newly reclaimed polders of the former Zuiderzee. In The Biology of Weeds, ed. J. L. Harper, pp. 205-22. Oxford, UK: Blackwell.

Ball, D. A., & Miller, S. D. (1989). A comparison of techniques for estimation of arable soil seedbanks and their relationship to weed flora. Weed Research, 29,365-73.

Ballaré, C. L., Scopel, A. L., Ghersa, C. M., & Sánchez, R. A. (1987a). The demography of Datura ferox (L.) in soybean crops. Weed Research, 27,91-102.

Ballaré, C. L., Scopel, A. L., Ghersa, C. M., & Sánchez, R. A. (1987b). The population ecology of Datura ferox in soybean crops: a simulation approach incorporating seed dispersal. Agriculture, Ecosystems and Environment, 19,177-88.

Barralis, G., Chadoeuf, R., & Lonchamp, J. P. (1988). Longévité des semences de mauvaises herbes annuelles dans un sol cultivé. Weed Research, 28,407-18.

Baskin, C. C., & Baskin, J. M. (1988). Germination ecophysiology of herbaceous plant species in a temperate region. American Journal of Botany, 75,286-305.

Baskin, C. C., & Baskin, J. M. (1998a). Seeds: Ecology, Biogeography, and Evolution of Dormancy and Germination. San Diego, CA: Academic Press.

Baskin, C. C., & Baskin, J. M. (1998b). Ecology of seed dormancy and germination in grasses. In Population Biology of Grasses, ed. G. P. Cheplich, pp. 30-83. Cambridge, UK: Cambridge University Press.

Baskin, J. M., & Baskin, C. C. (1980). Ecophysiology of secondary dormancy in seeds of Ambrosia artemisiifolia. Ecology, 61,475-80.

Baskin, J. M., & Baskin, C. C. (1983). Seasonal changes in the germination responses of buried seeds of Arabidopsis thaliana and ecological interpretation. Botanical Gazette, 144,540-3.

Baskin, J. M., & Baskin, C. C. (1985). The annual dormancy cycle in buried weed seeds: a continuum. BioScience, 35, 492-8.

Baskin, J. M., & Baskin, C. C. (1986). Seasonal changes in the germination responses of buried witchgrass (Panicum capillare) seeds. Weed Science, 34,22-4.

Baskin, J. M., & Baskin, C. C. (1987). Environmentally induced changes in the dormancy states of buried weed seeds. In 1987British Crop Protection Conference - Weeds, pp. 695-706. Croydon, UK: British Crop Protection Council.

Bauer, T. A., & Mortensen, D. A. (1992). A comparison of economic and economic optimum thresholds for two annual weeds in soybeans. Weed Technology, 6,228-35.

Bell, R. S., Lachman, W. H., Rahn, E. M., & Sweet, R. D. (1962). Life History Studies as related to Weed Control in the Northeast. 1. Nutgrass, University of Rhode Island Agricultural Experiment Station Bulletin no. 364. Kingston, RI: University of Rhode Island Agricultural Experiment Station.

Bello, I. A., Owen, M. D. K., & Hatterman-Valenti, H. M. (1995). Effect of shade on velvetleaf (Abutilon theophrasti) growth, seed production, and dormancy. Weed Technology, 9, 452-5.

Benvenuti, S., & Macchia, M. (1995). Effect of hypoxia on buried weed seed germination. Weed Research, 35,343-51.

Blackman, G. E., & Black, J. N. (1959). Physiological and ecological studies in the analysis of plant environment. XI. A further assessment of the influence of shading on the growth of different species in the vegetative phase. Annals of Botany, New Series, 23,51-63.

Blackman, G. E., & Templeman, W. G. (1938). The nature of the competition between cereal crops and annual weeds. Journal of Agricultural Science, 28,247-71.

Blackshaw, R. E., & Harker, K. N. (1997). Scentless chamomile (Matricaria perforata) growth, development, and seed production. Weed Science, 45,701-5.

Blackshaw, R. E., & Rode, L. M. (1991). Effect of ensiling and rumen digestion by cattle on weed seed viability. Weed Science, 39,104-8.

Bloemhard, C. M. J., Arts, M. W. M. F., Scheepens, P. C., & Elema, A. G. (1992). Thermal inactivation of weed seeds and tubers during drying of pig manure. Netherlands Journal of Agricultural Science, 40,11-19.

Bostock, S. J. (1978). Seed germination strategies of five perennial weeds. Oecologia (Berlin), 36,113-26.

Boutin, C., & Harper, J. L. (1991). A comparative study of the population dynamics of five species of Veronica in natural habitats. Journal of Ecology, 79,199-221.

Brennan, T., Willemsen, R., Rudd, T., & Frenkel, C. (1978). Interaction of oxygen and ethylene in the release of ragweed seeds from dormancy. Botanical Gazette, 139,46-9.

Bridges, D. C. (ed.) (1992). Crop Losses Due to Weeds in the United States -1992. Champaign, IL: Weed Science Society of America.

Brust, G. E., & House, G. J. (1988). Weed seed destruction by arthropods and rodents in low-input soybean agroecosystems. American Journal of Alternative Agriculture, 3,19-25.

Buchholtz, K. P., Grantz, R. L., Sweet, R. D., Timmons, F. L., & Vostral, H. J. (1967).

Subcommittee on Standardization ofAbbreviations, Terms and Definitions. Weeds, 15,388-9.

Buhler, D. D., & Owen, M. D. K. (1997). Emergence and survival of horseweed (Conyza canadensis). Weed Science, 45,98-101.

Burnside, O. C., Wilson, R. G., Weisberg, S., & Hubbard, K. G. (1996). Seed longevity of 41 weed species buried 17 years in eastern and western Nebraska. Weed Science, 44, 74-86.

Burton, G. W. (1948). Recovery and viability of seeds of certain southern grasses and lespedeza passed through the bovine digestive tract. Journal of Agricultural Research, 76,95-103.

Cardina, J., Sparrow, D. H., & McCoy, E. L. (1996). Spatial relationships between seedbank and seedling populations of common lambsquarters (Chenopodium album) and annual grasses. Weed Science, 44,298-308.

Chancellor, R. J. (1964). The depth of weed seed germination in the field. In Proceedings of the 7th British Weed Control Conference, pp. 599-606. London: British Crop Protection Council.

Chancellor, R. J. (1986). Decline of arable weed seeds during 20 years in soil under grass and the periodicity of seedling emergence after cultivation. Journal of Applied Ecology, 23,631-7.

Chancellor, R. J., & Peters, N. C. B. (1972). Germination periodicity, plant survival and seed production in populations of Avena fatua L. growing in spring barley. In

Proceedings of the 11th British Weed Control Conference, pp. 218-25. London: British Crop Protection Council.

Chapin, F. S. ill, Groves, R. H., & Evans, L. T. (1989). Physiological determinants of growth rate in response to phosphorus supply in wild and cultivated Hordeum species. Oecologia, 79,96-105.

Chepil, W. S. (1946). Germination of weed seeds. I. Longevity, periodicity of germination, and vitality of seeds in cultivated soil. Scientific Agriculture, 26,307-46.

Cohen, D. (1966). Optimizing reproduction in a randomly varying environment. Journal of Theoretical Biology, 12,119-29.

Comes, R. D., Bruns, V. F., & Kelley, A. D. (1978). Longevity of certain weed and crop seeds in fresh water. Weed Science, 26,336-44.

Conn, J. S., & Deck, R. E. (1995). Seed viability and dormancy of 17 weed species after 9.7 years of burial in Alaska. Weed Science, 43, 583-5.

Cousens, R., & Mortimer, M. (1995). Dynamics of Weed Populations. Cambridge, UK: Cambridge University Press.

Cousens, R., Doyle, C. J., Wilson, B. J., & Cussans, G. W. (1986). Modelling the economics of controlling Avena fatua in winter wheat. Pesticide Science, 17,1-12.

Cox, W. J., Zobel, R. W., van Es, H. M., & Otis, D. J. (1990). Tillage effects on some soil physical and corn physiological characteristics. Agronomy Journal, 82,806-12.

Cudney, D. W., Wright, S. D., Shultz, T. A., & Reints, J. S. (1992). Weed seed in dairy manure depends on collection site. California Agriculture, 46(3), 31-2.

Dastgheib, F. (1989). Relative importance of crop seed, manure and irrigation water as sources of weed infestation. Weed Research, 29,113-16.

Dawson, J. H., & Bruns, V. F. (1975). Longevity of barnyardgrass, green foxtail and yellow foxtail seeds in soil. Weed Science, 23,437-40.

Dewey, S. A., & Whitesides, R. E. (1990). Weed seed analyses from four decades of Utah small grain drillbox surveys. Proceedings of the Western Society of Weed Science, 43, 69-70.

Dewey, S. A., Thill, D. C., & Foote, P. W. (1985). Weed Seed Contamination of Cereal Grain Seedlots: A Drillbox Survey, Current Information Series no. 767. Moscow, ID: Cooperative Extension Service, Agricultural Experiment Station, University of Idaho.

Dieleman, J. A., & Mortensen, D. A. (1999). Characterizing the spatial pattern of Abutilon theophrasti seedling patches. Weed Research, 39,455-67.

Donald, C. M. (1961). Competition for light in crops and pastures. In Mechanisms in Biological Competition, Symposium of the Society for Experimental Biology, 15, pp. 283-313. New York: Academic Press.

Donald, W. W., & Zimdahl, R. L. (1987). Persistence, germinability, and distribution of jointed goatgrass (Aegilops cylindrica) seed in soil. Weed Science, 35,149-54.

Dony, J. G. (1953). Wool aliens in Bedfordshire. In The Changing Flora of the British Isles, ed. J. E. Lousley, pp. 160-3. Oxford, UK: Botanical Society of the British Isles.

Dou, Z., Fox, R. H., & Toth, J. D. (1995). Seasonal soil nitrate dynamics in corn as affected by tillage and nitrogen source. Soil Science Society of America Journal, 59,858-64.

Doyle, C. J., Cousens, R., & Moss, S. R. (1986). A model of the economics of controlling Alopecurus myosuroides Huds. in winter wheat. Crop Protection, 5,143-50.

Dunan, C. M., & Zimdahl, R. L. (1991). Competitive ability of wild oats (Avena fatua) and barley (Hordeum vulgare). Weed Science, 39,558-63.

Dyck, E., & Liebman, M. (1994). Soil fertility management as a factor in weed control: the effect of crimson clover residue, synthetic nitrogen fertilizer, and their interaction on emergence and early growth of lambsquarters and sweet corn. Plant and Soil, 167,227-37.

Edwards, M. M. (1969). Dormancy in seeds of charlock. IV. Interrelationships of growth, oxygen supply and concentration of inhibitor. Journal ofExperimental Botany, 20, 876-94.

Egley, G. H. (1995). Seed germination in soil: dormancy cycles. In Seed Development and Germination, ed. J. Kigel, & G. Galili, pp. 529-43. New York: Marcel Dekker.

Elder, R. H., & Osborne, D. J. (1993). Function of DNA synthesis and DNA repair in the survival of embryos during early germination and in dormancy. Seed Science Research, 3,43-53.

Fausey, J. C., & Renner, K. A. (1997). Germination, emergence, and growth of giant foxtail (Setaria faberi) and fall panicum (Panicum dichotomiflorum). Weed Science, 45,423-5.

Fawcett, R. S., & Silfe, F. W. (1978). Effects of field applications of nitrate on weed seed germination and dormancy. Weed Science, 26,594-6.

Feeny, P. (1976). Plant apparency and chemical defense. In Recent Advances in Phytochemistry, vol. 10, Biochemical Interaction between Plants and Insects, ed. J. W. Wallace, & R. L. Mansell, pp. 1-40. New York: Plenum Press.

Feeny, P. (1977). Defensive ecology of the Cruciferae. Annals of the Missouri Botanical Garden, 64,221-34.

Feldman, S. R., & Lewis, J. P. (1990). Output and dispersal of propagules of Carduus acanthoides L. Weed Research, 30,161-9.

Fellows, G. M., & Roeth, F. W. (1992). Factors influencing shattercane (Sorghum bicolor) seed survival. Weed Science, 40,434-40.

Fenner, M. (1978). Susceptibility to shade in seedlings of colonizing and closed turf species. New Phytologist, 81,739-44.

Forcella, F., & Wood, H. (1986). Demography and control of Cirsium vulgare (Savi) Ten. in relation to grazing. Weed Research, 26,199-206.

Forcella, F., Wilson, R. G., Dekker, J., Kremer, R. J., Cardina, J., Anderson, R. L., Alm, D., Renner, K. A., Harvey, R. G., Clay, S., & Buhler, D. D. (1997). Weed seed bank emergence across the corn belt. Weed Science, 45,67-76.

Forsyth, S. F., & Watson, A. K. (1985). Predispersal seed predation of Canada thistle. Canadian Entomologist, 117,1075-81.

Friedman, M., & Henika, P. R. (1991). Mutagenicity of toxic weed seeds in the Ames Test: jimson weed (Daturastramonium), velvetleaf (Abutilon theophrasti), morning glory (Ipomoea spp.), and sicklepod (Cassia obtusifolia). Journal of Agricultural and Food Chemistry, 39,494-501.

Froud-Williams, R.J. (1985). Dormancy and germination of arable grass-weeds. Aspects of Applied Biology, 9,9-18.

Froud-Williams, R. J. (1987). Survival and fate of weed seed populations: interaction with cultural practice. In 1987British Crop Protection Conference - Weeds, vol. 2, pp. 707-18. Croydon, UK: British Crop Protection Council.

Froud-Williams, R. J., Chancellor, R. J., & Drennan, D. S. H. (1984). The effects of seed burial and soil disturbance on emergence and survival of arable weeds in relation to minimal cultivation. Journal of Applied Ecology, 21,629-41.

Gallagher, R. S., & Cardina, J. (1998). Ecophysiological aspects of phytochrome-mediated germination in soil seed banks. Aspects of Applied Biology, 51,1-8.

Geber, M. A. (1989). Interplay of morphology and development on size inequality: a Polygonum greenhouse study. Ecological Monographs, 59,267-88.

Gebhardt, M. R., Daniel, T. C., Schweizer, E. E., & Allmaras, R. R. (1985). Conservation tillage. Science, 230,625-30.

Ghersa, C. M., Benech Arnold, R. L., & Martinez-Ghersa, M. A. (1992). The role of fluctuating temperatures in germination and establishment of Sorghum halepense. Regulation of germination at increasing depths. Functional Ecology, 6,460-8.

Ghersa, C. M., Martinez-Ghersa, M. A., Satorre, E. H., Van Esso, M. L., & Chichotky, G. (1993). Seed dispersal, distribution and recruitment of seedlings of Sorghum halepense (L.) Pers. Weed Research, 33,79-88.

Givnish, T. J. (1988). Adaptation to sun and shade: a whole-plant perspective. In Ecology of Photosynthesis in Sun and Shade, ed. J. R. Evans, S. von Caemmerer, & W. W. Adams ill, pp. 63-92. East Melbourne, Australia: Commonwealth Scientific and Industrial Research Organization.

Gleichsner, J. A., & Appleby, A. P. (1989). Effect of depth and duration of seed burial on ripgut brome (Bromus rigidus). Weed Science, 37,68-72.

Gorski, T. (1975). Germination of seeds in the shadow of plants. Physiologia Plantarum, 34, 342-6.

Grant, J. D. (1983). The activities of earthworms and the fates of seeds. In Earthworm Ecology, ed. J. E. Satchell, pp. 107-22. London: Chapman & Hall.

Grime, J. P., & Hunt, R. (1975). Relative growth-rate: its range and adaptive significance in a local flora. Journal of Ecology, 63,393-422.

Grubb, P. J. (1994). Root competition in soils of different fertility: a paradox resolved? Phytocoenologia, 24, 495-505.

Hakansson, S. (1968). Experiments with Agropyron repens (L.) Beauv. II. Production from rhizome pieces of different sizes and from seeds: various environmental conditions compared. Lantbrukshogskolans Annaler, 34,3-29.

Hakansson, S. (1983). Seasonal variation in the emergence of annual weeds: an introductory investigation in Sweden. Weed Research, 23,313-24.

Hakansson, S., & Wallgren, B. (1972). Experiments with Sonchus arvensis L. III. The development from reproductive roots cut into different lengths and planted at different depths, with and without competition from barley. SwedishJournal of Agricultural Research, 2,15-26.

Hald, A. B. (1999). The impact of changing the season in which cereals are sown on the diversity of the weed flora in rotational fields in Denmark. Journal of Applied Ecology, 36,24-32.

Harlan, J. R., & de Wet, J. M. J. (1965). Some thoughts about weeds. Economic Botany, 19, 16-24.

Harradine, A. R. (1986). Seed longevity and seedling establishment of Bromus diandrus Roth. Weed Research, 26,173-80.

Henson, I. E. (1970). The effects of light, potassium nitrate and temperature on the germination of Chenopodium album L. Weed Research, 10,27-39.

Holm, R. E. (1972). Volatile metabolites controlling germination in buried weed seeds. Plant Physiology, 50,293-7.

Holm, L. G., Plucknett, D. L., Pancho, J. V., & Herberger, J. P. (1977). The World's Worst Weeds. Honolulu, HI: University Press of Hawaii.

Horowitz, M. (1972). Development of Cynodon dactylon (L.) Pers. Weed Research, 12,207-20.

Horowitz, M., & Taylorson, R. B. (1984). Hardseededness and germinability of velvetleaf (Abutilon theophrasti) as affected by temperature and moisture. Weed Science, 32, 111-15.

Horowitz, M., & Taylorson, R. B. (1985). Behavior of hard and permeable seeds of Abutilon theophrasti Medic. (velvetleaf). Weed Research, 25,363-72.

Hosmani, M. M. (1995). Striga (a Noxious Root Parasitic Weed), 2nd edn. Dharwad, India: S. M. Hosmani.

Howard, C. L., Mortimer, A. M., Gould, P., Putwain, P. D., Cousens, R., & Cussans, G. W.

(1991). The dispersal of weeds: seed movement in arable agriculture. In Brighton Crop Protection Conference - Weeds, pp. 821-8. Farnham, UK: British Crop Protection Council.

Huelma, C. C., Moody, K., & Mew, T. W. (1996). Weed seeds in rice seed shipments: a case study. International Journal of Pest Management, 42,147-50.

Hulme, P. E. (1994). Post-dispersal seed predation in grassland: its magnitude and sources of variation. Journal of Ecology, 82,645-52.

Hunter, P.J. (1967). The effect of cultivations on slugs of arable land. Plant Pathology, 16, 153-6.

Jensen, H. A. (1969). Content of buried seeds in arable soil in Denmark and its relation to the weed population. Dansk Botanisk Arkiv, 27(2), 7-56.

Kannangara, H. W., & Field, R. J. (1985). Environmental and physiological factors affecting the fate of seeds of yarrow (Achillea millefolium L.) in arable land in New Zealand. Weed Research, 25,87-92.

Kaul, V. (1965). Physiological ecology of Xanthium strumarium Linn. II. Physiology of seeds in relation to its distribution. Indian Botanical Society Journal, 44,365-80.

Kelley, A. D., & Bruns, V. F. (1975). Dissemination of weed seeds by irrigation water. Weed Science, 23,486-93.

Kegode, G. O., Forcella, F., & Durgan, B. R. (1999). Limiting green and yellow foxtail (Setaria viridis and S.glauca) seed production following spring wheat (Triticum aestivum) harvest. Weed Technology, 13,43-7.

Kigel, J. (1994). Development and ecophysiology of Amaranths. In Amaranth: Biology,

Chemistry, and Technology, ed. O. Paredes-Lopez, pp. 39-73. Ann Arbor, MI: CRC Press.

Kigel, J., & Koller, D. (1985). Asexual reproduction of weeds. In Weed Physiology, vol. 1:

Reproduction and Ecophysiology, ed. S. O. Duke, pp. 65-100. Boca Raton, FL: CRC Press.

King, T. J. (1975). Inhibition of seed germination under leaf canopies in Arenaria serpyllifolia, Veronica arvensis and Cerastum (sic) holosteoides. New Phytologist, 75,87-90.

Kingsbury, J. M. (1964). Poisonous Plants of the United States and Canada. Englewood Cliffs, NJ: Prentice-Hall.

Kirk, J., & Courtney, A. D. (1972). A study of the survival of wild oats (Avena fatua) seeds buried in farm yard manure and fed to bullocks. In Proceedings of the 11th British Weed Control Conference, pp. 226-33. London: British Crop Protection Council.

Knake, E. L. (1972). Effect of shade on giant foxtail. Weed Science, 20,588-92.

Knezevic, S. Z., & Horak, M. J. (1998). Influence of emergence time and density on redroot pigweed (Amaranthus retroflexus). Weed Science, 46,665-72.

Kremer, R. J., & Spencer, N. R. (1989a). Impact of a seed-feeding insect and microorganisms on velvetleaf (Abutilon theophrasti) seed viability. Weed Science, 37,211-16.

Kremer, R. J., & Spencer, N. R. (1989b). Interaction of insects, fungi, and burial on velvetleaf (Abutilon theophrasti) seed viability. Weed Technology, 3,322-8.

LaCroix, L. J., & Staniforth, D. W. (1964). Seed dormancy in velvetleaf. Weeds, 12,171-4.

Lambers, H., & H. Poorter. (1992). Inherent variation in growth rate between higher plants: a search for physiological causes and ecological consequences. Advances in Ecological Research, 23,187-261.

Lapham, J. (1985). Unrestricted growth, tuber formation and spread of Cyperus esculentus L. in Zimbabwe. Weed Research, 25,323-9.

Lapointe, A.-M., Deschênes, J.-M., Gervai, P., & Lemieux, C. (1984). Biologie du chénopode blanc (Chenopodium album): influence du travail du sol sur la levée et de la densité du peuplement sur la croissance. Canadian Journal of Botany, 62,2587-93.

Law, R., Bradshaw, A. D., & Putwain, P. D. (1977). Life-history variation in Poa annua. Evolution, 31,233-46.

Lawson, H. M., & Wiseman, J. S. (1979). Competition between weeds and transplanted spring cabbage: effects of nitrogen top-dressing. Horticultural Research, 19,25-34.

Lawson, H. M., Waister, P. D., & Stephens, R. J. (1974). Patterns of emergence of several important arable weed species. British Crop Protection Conference Monographs, 9, 121-35.

Légère, A., & Schreiber, M. M. (1989). Competition and canopy architecture as affected by soybean (Glycine max) row width and density of redroot pigweed (Amaranthus retroflexus). Weed Science, 37,84-92.

Lieth, H. (1960). Patterns of change within grassland communities. In The Biology of Weeds, ed. J. L. Harper, pp. 27-39. Oxford,UK: Blackwell.

Lindquist, J. L., Maxwell, B. D., Buhler, D. D., & Gunsolus, J. L. (1995). Velvetleaf (Abutilon theophrasti) recruitment, survival, seed production, and interference in soybean (Glycine max). Weed Science, 43,226-32.

Loomis, R. S., & Connor, D. J. (1992). Crop Ecology. Cambridge, UK: Cambridge University Press.

Lovely, W. G., Weber, C. R., & Staniforth, D. W. (1958). Effectiveness of the rotary hoe for weed control in soybeans. Agronomy Journal, 50,621-5.

Lovett Doust, L., MacKinnon, A., & Lovett Doust, J. (1985). Biology of Canadian weeds. 71. Oxalis stricta L., O. corniculata L., O. dillenii Jacq. ssp. dillenii and O. dillenii Jacq. ssp. filipes (Small) Eiten. Canadian Journal ofPlant Science, 65,691-709.

Lueschen, W. E., & Andersen, R. N. (1980). Longevity of velvetleaf (Abutilon theophrasti) seeds in soil under agricultural practices. Weed Science, 28,341-6.

Mack, R. N. (1981). Invasion of Bromus tectorum L. into western North America: an ecological chronicle. Agro-Ecosystems, 7,145-65.

Mack, R. N., & Pyke, D. A. (1983). The demography of Bromus tectorum: variation in time and space. Journal of Ecology, 71,69-93.

Marshall, E. J. P. (1989). Distribution patterns of plants associated with arable field edges. Journal of Applied Ecology, 26,247-57.

Maxwell, B, D., & Ghersa, C. (1992). The influence of weed seed dispersion versus the effect of competition on crop yield. Weed Technology, 6,196-204.

Mayer, F., Albrecht, H., & Pfadenhauer, J. (1998). The transport of seeds by soil-working implements. In Weed Seedbanks: Determination, Dynamics and Manipulation, ed. G. T. Champion, A. C. Grundy, N. E. Jones, E. J. P. Marshall & R. J. Froud-Williams, pp. 83-9. Wellesbourne, UK: Association of Applied Biologists.

McCanny, S. J., & Cavers, P. B. (1988). Spread of proso millet (Panicum miliaceum L.) in Ontario, Canada. II. Dispersal by combines. Weed Research, 28,67-72.

McCanny, S. J., Baugh, M., & Cavers, P. B. (1988). Spread of proso millet (Panicum miliaceum L.) in Ontario, Canada. I. Rate of spread and crop susceptibility. Weed Research, 28, 59-65.

McEvoy, P. B., Rudd, N. T., Cox, C. S., & Huso, M. (1993). Disturbance, competition, and herbivory effects on ragwort Senecio jacobaea populations. Ecological Monographs, 63, 55-75.

McLachlan, S. M., Tollenaar, M., Swanton, C. J., & Weise, S. F. (1993). Effect of corn-induced shading on dry matter accumulation, distribution, and architecture of redroot pigweed (Amaranthus retroflexus). Weed Science, 41,568-73.

McWilliams, E. L., Landers, R. Q., & Mahlstede, J. P. (1968). Variation in seed weight and germination in populations of Amaranthus retroflexus L. Ecology, 49,290-6.

Michaux, B. (1989). Reproductive and vegetative biology of Cirsium vulgare (Savi) Ten. (Compositae: Cynareae). New ZealandJournal of Botany, 27,401-14.

Mohler, C. L. (1991). Effects of tillage and mulch on weed biomass and sweet corn yield. Weed Technology, 5,545-52.

Mohler, C. L. (1993). A model of the effects of tillage on emergence of weed seedlings. Ecological Applications, 3,53-73.

Mohler, C. L. (1995). A living mulch (white clover) / dead mulch (compost) weed control system for winter squash. Proceedings of the Northeastern Weed Science Society, 49, 5-10.

Mohler, C. L. (1996). Ecological bases for the cultural control of annual weeds. Journal of Production Agriculture, 9, 468-74.

Mohler, C. L., & Callaway, M. B. (1992). Effects of tillage and mulch on the emergence and survival of weeds in sweet corn. Journal of Applied Ecology, 29,21-34.

Mohler, C. L., & Callaway, M. B. (1995). Effects of tillage and mulch on weed seed production and seed banks in sweet corn. Journal of Applied Ecology, 32,627-39.

Mohler, C. L., & Galford, A. E. (1997). Weed seedling emergence and seed survival:

separating the effects of seed position and soil modification by tillage. Weed Research, 37,147-55.

Mortensen, D. A., Johnson, G. A., & Young, L. J. (1993). Weed distribution in agricultural fields. In Soil Specific Crop Management, ed. P. C. Robert, R. H. Rust & W. F. Larson, pp. 113-24. Madison, WI: American Society of Agronomy.

Mortimer, A. M. (1976). Aspects of the seed population dynamics of Dactylis glomerata L., Holcus lanatus L., Plantago lanceolata L., and Poa annua L. In Proceedings of the 1976 British Crop Protection Conference-Weeds, pp. 687-94. Croydon, UK: British Crop Protection Council.

Morton, C. T., & Buchele, W. F. (1960). Emergence energy of plant seedlings. Agricultural Engineering, 41,428-31,453-5.

Moss, S. R. (1983). The production and shedding of Alopecurus myosuroides Huds. seeds in winter cereals crops. Weed Research, 23,45-51.

Mt. Pleasant, J., & Schlather, K. J. (1994). Incidence of weed seed in cow (Bos sp.) manure and its importance as a weed source for cropland. Weed Technology, 8,304-10.

Mulugeta, D., & Stoltenberg, D. E. (1997). Increased weed emergence and seed bank depletion by soil disturbance in a no-tillage system. Weed Science, 45,234-41.

Musselman, L. J., (ed.) (1987). Parasitic Weeds in Agriculture, vol. 1, Striga. Boca Raton, FL: CRC Press.

Naylor, R. E. L. (1972). Aspects of the population dynamics of the weed Alopecurus myosuroides Huds. in winter cereal crops. Journal of Applied Ecology, 9,127-39.

Naylor, J. M. (1983). Studies on the genetic control of some physiological processes in seeds. Canadian Journal of Botany, 61,3561-7.

New York Agricultural Statistics Service (1994). New York Agricultural Statistics 1993-1994.

Albany, NY: New York State Department of Agriculture and Markets, Division of Statistics.

Nichols, M. L., & Reed, I. F. (1934). Soil dynamics. VI. Physical reactions of soil to moldboard surfaces. Agricultural Engineering, 15,187-90.

Norris, R. F. (1992). Case history for weed competition/population ecology: barnyardgrass (Echinochloa crus-galli) in sugarbeets (Beta vulgaris). Weed Technology, 6,220-7.

Odum, S. (1965). Germination of ancient seeds: floristical observations and experiments with archaeologically dated soil samples. Dansk Botanisk Arkiv, 24,1-70.

Osborne, D. J. (1980). Senescence in seeds. In Senescence in Plants, ed. K. V. Thimann, pp. 13-37. Boca Raton, FL: CRC Press.

Özer, Z. (1979). Über die Beeinflussung der Keimfähigkeit der Samen mancher

Gründlandpflanzen beim Durchgang durch den Verdauungstrakt des Schafes und nach Mistgärung. Weed Research, 19,247-54.

Pemberton, R. W., & Irving, D. W. (1990). Elaiosomes on weed seeds and the potential for myrmecochory in naturalized plants. Weed Science, 38,615-19.

Philippi, T. (1993). Bet-hedging germination of desert annuals: beyond the first year. American Naturalist, 142,474-87.

Pieterse, A. H., Verkleij, J. A. C., & ter Borg, S. J. (eds) (1994). Biology and Management of

Orobanche; Proceedings of the 3rd International Workshop on Orobanche and Related Striga Research. Amsterdam, The Netherlands: Royal Tropical Institute.

Pitelli, R. A., Charudattan, R., & Devalerio, J. T. (1998). Effect of Alternaria cassiae,

Pseudocercospora nigricans, and soybean (Glycine max) planting density on the biological control of sicklepod (Senna obtusifolia). Weed Technology, 12,37-40.

Plummer, G. L., & Keever, C. (1963). Autumnal daylight weather and camphor-weed dispersal in the Georgia Piedmont region. Botanical Gazette, 124,283-9.

Pons, T. L. (1989). Breaking of seed dormancy by nitrate as a gap detection mechanism. Annals of Botany, 63,139-43.

Popay, A. I., & Roberts, E. H. (1970). Factors involved in the dormancy and germination of Capsella bursa-pastoris (L.) Medik. and Senecio vulgaris L. Journal of Ecology, 58, 103-22.

Popay, I., & Field, R. (1996). Grazing animals as weed control agents. Weed Technology, 10, 217-31.

Povilaitis, B. (1956). Dormancy studies with seeds of various weed species. Proceedings of the International Seed Testing Association, 21,88-111.

Proctor, V. W. (1968). Long-distance dispersal of seeds by retention in digestive tract of birds. Science, 160,321-2.

Qasem, J. R. (1992). Nutrient accumulation by weeds and their associated vegetable crops. Journal of Horticultural Science, 67,189-95.

Qi, M., Upadhyaya, M. K., & Turkington, R. (1996). Dynamics of seed bank and survivorship of meadow salsify (Tragopogon pratensis) populations. Weed Science, 44, 100-8.

Rao, A. N., & Moody, K. (1990). Weed seed contamination in rice seed. Seed Science and Technology, 18,139-46.

Regnier, E. E., & Harrison, S. K. (1993). Compensatory responses of common cocklebur

(Xanthium strumarium) and velvetleaf (Abutilon theophrasti) to partial shading. Weed Science, 41,541-7.

Regnier, E. E., & Stoller, E. W. (1989). The effects of soybean (Glycine max) interference on the canopy architecture of common cocklebur (Xanthium strumarium), jimsonweed (Datura stramonium), and velvetleaf (Abutilon theophrasti). Weed Science, 37,187-95.

Rew, L. J., & Cussans, G. W. (1997). Horizontal movement of seeds following tine and plough cultivation: implications of spatial dynamics of weed infestations. Weed Research, 37,247-56.

Rew, L. J., Froud-Williams, R. J., & Boatman, N. D. (1996). Dispersal of Bromus sterilis and Anthriscus sylvestris seed within arable field margins. Agriculture, Ecosystems and Environment, 59,107-14.

Roberts, E. H. (1972). Dormancy: a factor affecting seed survival in the soil. In Viability of Seeds, ed. E. H. Roberts, pp. 321-59. Syracuse, NY: Syracuse University Press.

Roberts, E. H. (1988). Seed aging: the genome and its expression. In Senescence and Aging in Plants, ed. L. D. Nooden & A. C. Leopold, pp. 465-98. San Diego, CA: Academic Press.

Roberts, H. A. (1984). Crop and weed emergence patterns in relation to time of cultivation and rainfall. Annals of Applied Biology, 105,263-75.

Roberts, H. A. (1986). Persistence of seeds of some grass species in cultivated soil. Grass and Forage Science, 41,273-6.

Roberts, H. A., & Benjamin, S. K. (1979). The interaction of light, nitrate and alternating temperature on the germination of Chenopodium album, Capsella bursa-pastoris and Poa annua before and after chilling. Seed Science and Technology, 7,379-92.

Roberts, H. A., & Dawkins, P. A. (1967). Effect of cultivation on the numbers of viable weed seeds in soil. Weed Research, 7,290-301.

Roberts, H. A., & Feast, P. M. (1972). Fate of seeds of some annual weeds in different depths of cultivated and undisturbed soil. Weed Research, 12,316-24.

Roberts, H. A., & Feast, P. M. (1973). Changes in the numbers of viable weed seeds in soil under different regimes. Weed Research, 13,298-303.

Roberts, H. A., & Lockett, P. M. (1975). Germination of buried and dry-stored seeds of Stellaria media. Weed Research, 15,199-204.

Roberts, H. A., & Neilson, J. E. (1980). Seed survival and periodicity of seedling emergence in some species of Atriplex, Chenopodium, Polygonum and Rumex. Annals of Applied Biology, 94,111-120.

Roberts, H. A., & Potter, M. E. (1980). Emergence patterns of weed seedlings in relation to cultivation and rainfall. Weed Research, 20,377-86.

Root, R. (1973). Organization of a plant-arthropod association in simple and diverse habitats: the fauna of collards (Brassica oleracea). Ecological Monographs, 42,95-124.

Sagar, G. R., & Mortimer, A. M. (1976). An approach to the study of the population dynamics of plants with special reference to weeds. Applied Biology, 1,1-43.

Salisbury, E. J. (1942). The Reproductive Capacity ofPlants. London: Bell.

Salisbury, E. J. (1961). Weeds and Aliens. London: Collins.

Sarapatka, B., Holub, M., & Lhotská, M. (1993). The effect of farmyard manure anaerobic treatment on weed seed viability. Biological Agriculture and Horticulture, 10,1-8.

Sauer, J., & Struik, G. (1964). A possible ecological relation between soil disturbance, lightflash, and seed germination. Ecology, 45,884-6.

Schafer, D. E., & Chilcote, D. O. (1970). Factors influencing persistence and depletion in buried seed populations. II. The effects of soil temperature and moisture. Crop Science, 10,342-5.

Schippers, P., Ter Borg, S. J., Van Groenendael, J. M., & Habekotte, B. (1993). What makes Cyperus esculentus (yellow nutsedge) an invasive species? - A spatial model approach. In Brighton Crop Protection Conference - Weeds, pp. 495-504. Farnham, UK: British Crop Protection Council.

Schlapfer, B., & Ryser, P. (1996). Leaf and root turnover of three ecologically contrasting grass species in relation to their performance along a productivity gradient. Oikos, 75,398-406.

Schmidt, W. (1989). Plant dispersal by motor cars. Vegetatio, 80,147-52.

Scopel, A. L., Ballaré, C. L., & Sánchez, R. A. (1991). Induction of extreme light sensitivity in buried weed seeds and its role in the perception of soil cultivations. Plant, Cell and Environment, 14,501-8.

Seibert, A. C., & Pearce, R. B. (1993). Growth analysis of weed and crop species with reference to seed weight. Weed Science, 41,52-6.

Selleck, G. W. (1958). Life history of leafy spurge. In Proceedings of the 15th Annual Meeting, North Central Weed Control Conference, pp. 16-17.

Sharrow, S. H., & Mosher, W. D. (1982). Sheep as a biological control agent for tansy ragwort. Journal of Range Management, 35,480-2.

Silvertown, J. (1980). Leaf-canopy-induced seed dormancy in a grassland flora. New Phytologist, 85,109-18.

Slagell Gossen, R. R., Tyrl, R. J., Hauhouot, M., Peeper, T. F., Claypool, P. L., & Solie, J. B. (1998). Effects of mechanical damage on cheat (Bromus secalinus) caryopsis anatomy and germination. Weed Science, 46,249-57.

Smith, C. J., Elston, J., & Bunting, A. H. (1971). The effects of cutting and fertilizer treatments on the yield and botanical composition of chalk turf. Journal of the British Grassland Society, 26,213-19.

Smith, J. E., & Jordan, P. W. (1993). Sicklepod (Cassia obtusifolia) shoot structure as affected by soybean (Glycine max) interference. Weed Science, 41,75-81.

Smith, L. M., & Kok, L. T. (1984). Dispersal of musk thistle (Carduus nutans) seeds. Weed Science, 32,120-5.

Spitters, C. J. T., & Kramer, T. (1985). Changes in relative growth rate with plant ontogeny in spring wheat genotypes grown as isolated plants. Euphytica, 34,833-47.

Staver, C. (1991). The role of weeds in the productivity of Amazonian bush fallow agriculture. Experimental Agriculture, 27,287-304.

Steinbauer, G. P., & Grigsby, B. (1957a). Interaction of temperature, light, and moistening agent in the germination of weed seeds. Weeds, 3,175-82.

Steinbauer, G. P., & Grigsby, B. (1957b). Dormancy and germination characteristics of the seeds of four species of Plantago. Proceedings of the Association of Official Seed Analysts of North America, 47,158-64.

Stevens, O. A. (1932). The number and weight of seeds produced by weeds. American Journal of Botany, 19,784-94.

Stoller, E. W., & Wax, L. M. (1974). Dormancy changes and fate of some annual weed seeds in the soil. Weed Science, 22,151-5.

Takabayashi, M., Kubota, T., & Abe, H. (1979). Dissemination of weed seeds through cow feces. Japan Agricultural Research Quarterly, 13,204-7.

Tanji, A., Zimdahl, R. L., & Westra, P. (1997). The competitive ability of wheat (Triticum aestivum) compared to rigid ryegrass (Lolium rigidum) and cowcockle (Vaccaria hispanica). Weed Science, 45,481-7.

Tasrif, A., Sahid, I. B., Sastroutomo, S. S., & Latiff, A. (1991). Purity study of imported leguminous cover crops. Plant Protection Quarterly, 6,190-3.

Taylorson, R. B. (1970). Changes in dormancy and viability of weed seeds in soils. Weed Science, 18,265-9.

Taylorson, R. B. (1972). Phytochrome controlled changes in dormancy and germination of buried weed seeds. Weed Science, 20,417-22.

Taylorson, R. B. (1979). Response of weed seeds to ethylene and related hydrocarbons. Weed Science, 27,7-10.

Taylorson, R. B. (1987). Environmental and chemical manipulation of weed seed dormancy. Reviews of Weed Science, 3,135-54.

Teasdale, J. R. (1998). Cover crops, smother plants, and weed management. In Integrated Weed and Soil Management, ed. J. L. Hatfield, D. D. Buhler & B. A. Stewart, pp. 247-70. Chelsea, MI: Ann Arbor Press.

Thompson, K., Band, S. R., & Hodgson, J. G. (1993). Seed size and shape predict persistence in soil. Functional Ecology, 7,236-41.

Thompson, K., Bakker, J. P., Bekker, R. M., & Hodgson, J. G. (1998). Ecological correlates of seed persistence in soil in the north-west European flora. Journal of Ecology, 86, 163-9.

Thurston, J. M. (1960). Dormancy in weed seeds. In The Biology of Weeds, British Ecological Society Symposium no. 1, ed. J. L. Harper, pp. 69-82. Oxford, UK: Blackwell.

Thurston, J. M. (1966). Survival of seeds of wild oats (Avena fatua L. and Avena ludoviciana Dur.) and charlock (Sinapis arvensis L.) in soil under leys. Weed Research, 6,67-80.

Tilman, D. (1982). Resource Competition and Community Structure. Princeton, NJ: Princeton University Press.

Tilman, D., & Wedin, D. (1991a). Plant traits and resource reduction for five grasses growing on a nitrogen gradient. Ecology, 72,685-700.

Tilman, D., & Wedin, D. (1991b). Dynamics of nitrogen competition between successional grasses. Ecology, 72,1038-49.

Tompkins, D. K., Chaw, D., & Abiola, A. T. (1998). Effect of windrow composting on weed seed germination and viability. Compost Science and Utilization, 6,30-4.

Tonkin, J. H. B. (1982). The presence of seed impurities in samples of cereal seed tested at the official seed testing station, Cambridge in the period of 1978-1981. Aspects of Applied Biology, 1,163-71.

Totterdell, S., & Roberts, E. H. (1980). Characteristics of alternating temperatures which stimulate loss of dormancy in seeds of Rumex obtusifolius L. and Rumex crispus L. Plant, Cell and Environment, 3,3-12.

Tumbleson, M. E., & Kommedahl, T. (1961). Reproductive potential of Cyperus esculentus by tubers. Weeds, 9,646-53.

Turkington, R., & Harper, J. L. (1979). The growth, distribution and neighbour relationships of Trifolium repens in a permanent pasture. I. Ordination, pattern and contact. Journal of Ecology, 67,201-18.

Vengris, J., Colby, W. G., & Drake, M. (1955). Plant nutrient competition between weeds and corn. Agronomy Journal, 47,213-16.

Vengris, J., Drake, M., Colby, W. G., & Bart, J. (1953). Chemical composition of weeds and accompanying crop plants. Agronomy Journal, 45,213-18.

Villiers, T. A (1973). Ageing and the longevity of seeds in field conditions. In Seed Ecology, Proceedings of the 19th Easter School in Agricultural Sciences, University ofNottingham, 1972, ed. W. Heydecker, pp. 265-88. University Park, PA: Pennsylvania State University Press.

Villiers, T. A. (1980). Ultrastructural changes in seed dormancy and senescence. In Senescence in Plants, ed. K. V. Thimann, pp. 39-66. Boca Raton, FL: CRC Press.

Villiers, T. A., & Edgcumbe, D. J. (1975). On the cause of seed deterioration in dry storage. Seed Science and Technology, 3,761-74.

Vincent, E. M., & Roberts, E. H. (1977). The interaction of light, nitrate and alternating temperature in promoting the germination of dormant seeds of common weed species. Seed Science and Technology, 5,659-70.

Wareing, P. F., & Foda, H. A. (1957). Growth inhibitors and dormancy in Xanthium seed. Physiologia Plantarum, 10,266-80.

Warnes, D. D., & Andersen, R. N. (1984). Decline of wild mustard (Brassica kaber) seeds in soil under various cultural and chemical practices. Weed Science, 32,214-17.

Warwick, S. I., & Black, L. D. (1988). The biology of Canadian weeds. 90. Abutilon theophrasti. Canadian Journal of Plant Science, 68,1069-85.

Weaver, S. E., & Lechowicz, M. J. (1983). The biology of Canadian weeds. 56. Xanthium strumarium L. Canadian Journal of Plant Science, 63,211-25.

Weaver, S. E., & Riley, W. R. (1982). The biology of Canadian weeds. 53. Convolvulus arvensis L. Canadian Journal ofPlant Science, 62, 461-72.

Weaver, S. E., & Thomas, A. G. (1986). Germination responses to temperature of atrazine-resistant and -susceptible biotypes of two pigweed (Amaranthus) species. Weed Science, 34,865-70.

Webster, T. M., Cardina, J., & Loux, M. M. (1998). The influence of weed management in wheat (Triticum aestivum) stubble on weed control in corn (Zea mays). Weed Technology, 12, 522-6.

Weiss, P. W. (1981). Spatial distribution and dynamics of populations of the introduced annual Emex australis in south-eastern Australia. Journal of Applied Ecology, 18,849-64.

Wellington, P. S. (1960). Assessment and control of the dissemination of weeds by crop seeds. In The Biology ofWeeds, ed. J. L. Harper, pp. 94-107. Oxford, UK: Blackwell.

Wesson, G., & Wareing, P. F. (1969a). The induction of light sensitivity in weed seeds by burial. Journal of Experimental Botany, 20,414-25.

Wesson, G., & Wareing, P. F. (1969b). The role of light in the germination of naturally occurring populations ofburied seeds. Journal of Experimental Botany, 20,402-13.

White, J. (1979). The plant as a metapopulation. Annual Review of Ecology and Systematics, 10, 109-45.

Wilcut, J. W., Dute, R. R., Truelove, B., & Davis, D. E. (1988). Factors limiting the distribution of cogongrass, Imperata cylindrica and torpedograss, Panicum repens. Weed Science, 36,577-82.

Wiles, L. J., Oliver, G. W., York, A. C., Gold, H. J., & Wilkerson, G. G. (1992). Spatial distribution of broadleaf weeds in North Carolina soybean (Glycine max) fields. Weed Science, 40,554-7.

Williams, J. T., & Harper, J. L. (1965). Seed polymorphism and germination. I. The influence of nitrates and low temperatures on the germination of Chenopodium album. Weed Research, 5,141-50.

Wilson, B. J. (1972). Studies of the fate of Avena fatua seeds on cereal stubble as influenced by autumn treatment. In Proceedings of the 11th British Weed Control Conference, pp. 242-7. London: British Crop Protection Council.

Wilson, B. J., & Brain, P. (1991). Long-term stability of distribution of Alopecurus myosuroides Huds. within cereal fields. Weed Research, 31,367-73.

Wilson, B. J., & Cussans, G. W. (1972). The effect of autumn cultivations on the emergence of Avena fatua seedlings. In Proceedings of the 11th British Weed Control Conference, pp. 234-41. London: British Crop Protection Council.

Wilson, B. J., & Lawson, H. M. (1992). Seedbank persistence and seedling emergence of seven weed species in autumn-sown crops following a single year's seeding. Annals of Applied Biology, 120,105-16.

Wilson, P. J., & Aebischer, N. J. (1995). The distribution of dicotyledonous arable weeds in relation to distance from the field edge. Journal of Applied Ecology, 32,295-310.

Wilson, R. G. Jr. (1980). Dissemination of weed seeds by surface irrigation water in western Nebraska. Weed Science, 28,87-92.

Yenish, J. P., Fry, T. A., Durgan, B. R., & Wyse, D. L. (1997). Establishment of common milkweed (Asclepias syriaca) in corn, soybean, and wheat. Weed Science, 45,44-53.

Young, F. L. (1986). Russian thistle (Salsola iberica) growth and development in wheat (Triticum aestivum). Weed Science, 34,901-5.

Zahnley, J. W., & Fitch, J. B. (1941). Effect of ensiling on the viability of weed seeds. Journal of the American Society of Agronomy, 33,816-22.

Zanin, G., & Sattin, M. (1988). Threshold level and seed production of velvetleaf (Abutilon theophrasti Medicus) in maize. Weed Research, 28,347-52.

Zanin, G., Berti, A., & Zuin, M. C. (1989). Estimation du stock semencier d'un sol labouré ou en semis direct. Weed Research, 29,407-17.

Zorner, P. S., Zimdahl, R. L., & Schweizer, E. E. (1984a). Sources of viable seed loss in buried dormant and non-dormant populations of wild oat (Avena fatua L.) seed in Colorado. Weed Research, 24,143-50.

Zorner, P. S., Zimdahl, R. L., & Schweizer, E. E. (1984b). Effect of depth and duration of seed burial on kochia (Kochia scoparia). Weed Science, 32,602-7.

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