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Weed population responses to weed control practices. II. Residual effects on weed populations, control, and Glycine max yield

Weed population responses to weed control practices. II. Residual effects on weed populations, control, and Glycine max yield

Weed Science 47(4): 423-426

Weed populations, weed control with imazethapyr, and Glycine max yields were affected by a 4-yr history of different weed control practices. A range of chemical and mechanical practices were applied in separate field experiments initiated under high and low weed densities. In the high-density experiment, plots kept weed free for 4 yr averaged 24 Setaria faberi plants m(-2) compared with 200 to 600 plants m(-2) with the various weed control treatments. In plots with a history of mechanical control, weeds not controlled by imazethapyr reduced G. max yield by 340 kg ha(-1) compared with plots that were kept weed free during the same period. In the low-density experiment, weed control history had less effect on weed densities. For example, S. faberi densities ranged from 19 plants m(-2) for the weed-free plots to 195 plants m(-2) with mechanical control. Weed control history had little effect on weed control with imazethapyr or G. max yields in imazethapyr-treated plots. While weed-free conditions for 4 yr greatly reduced weed densities, imazethapyr application still increased G. max yields 22% in the low-density experiment and 51% in the high-density experiment. Differences in densities of individual annual broadleaf species also developed in response to weed control history in both experiments.

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Accession: 003612653

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DOI: 10.1017/s004317450009202x

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