Physical removal of perennating organs from the field

Severe infestations of species with perennating organs near the surface may be substantially reduced in density by removal of roots and rhizomes from the field. Typically, the soil is plowed, roots or rhizomes are worked to the surface with a spring tooth harrow and then pulled to the edge of the field with a rake or harrow (Travers, 1950). Rhizomes should be broken as little as possible during primary tillage, since longer pieces are more easily sorted to the surface (Kouwenhoven & Terpstra, 1979). With current technology, removal of roots and rhizomes is only practical on small fields; on large fields, much of this material falls through the tines and remains in the field. In principle, machines to strain out and collect storage roots and rhizomes should be possible.

Growing Soilless

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