Materials And Methods

All experiments were conducted at the farmer-owned and -managed Farm-Scale Intensive Cropping Study (FICS) near Sterling, Colorado (Johnson et al., 2001) (Figure 18.2). This dryland experiment encompasses a contiguous section of farmland (=250 ha) managed for nearly seventy years in a traditional winter wheat (Triticum aestivum L.)—fallow rotation using conventional tillage.

FIGURE 18.2 Site map for the Farm-Scale Intensive Cropping Study in northeast Colorado, located in the heart of the Central Great Plains.
FIGURE 18.3 Farm-Scale Intensive Cropping Study: experimental layout and electrical conductivity map. W = winter wheat, C = corn, M = millet, and F = fallow.

In 1999, it was converted to an intensified no-till winter wheat to corn (Zea Mays L.) to proso millet (Panicum miliaceum L.) to fallow rotation. Crop treatments were assigned to each of the eight =31 ha fields within the site (Figure 18.3) so that each phase of the 4-year rotation was present in two replicates each year.

In 1999, the experimental site was ECa mapped (0 to 30 and 0 to 90 cm depths) by direct contact, using a Veris 3100 Sensor Cart (Veris Technologies, a division of Geoprobe Systems, Salina, KS) (Figure 18.3), and separated into four zones (ranges) of ECa: low, medium low, medium high, and high (Figure 18.4 and Table 18.1). This was done by individually interpolating ECa field maps (0 to 30 cm) by inverse-distance weighting and spatially clustering the interpolated data into twelve classes

FIGURE 18.4 Farm-Scale Intensive Cropping Study ECa zone map and soil sampling scheme.

FIGURE 18.4 Farm-Scale Intensive Cropping Study ECa zone map and soil sampling scheme.

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