![]() No consistent effect of field type on Setaria viridis populations was observed. sativa/cereal fields than in continuous cereal crops. Population differences between field types were nonsignificant for Amaranthus retroflexus, Chenopodium album, and Polygonum convolvulus, and although populations of Taraxacum officinale and Thlaspi arvense were greater in M. arvense and Avena fatua indicated that these weeds were also more patchy in the M. sativa than in cereal fields that had been preceded by a cereal crop. Naturally occurring populations of Avena fatua, Cirsium arvense, Brassica kaber, and Galium aparine were lower in cereal fields that had previously contained M. sativa in crop rotations resulted in weed communities different from those of continuous cereal fields. Principle component analysis indicated that the inclusion of M. A total of 117 fields were surveyed approximately half from each field type. A survey was conducted in Manitoba, Canada, in 19 to investigate weed populations in commercial cereal fields that had been preceded by either M. sativa on weed populations in current cropping systems is lacking. ![]() Quantitative information regarding the suppressive effect of M. ![]() The ability of Medicago sativa to suppress weed growth may provide a viable alternative to chemical weed control and allow crop producers to reduce herbicide inputs.
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