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Title: DOES EARLY INJURY FROM POSTEMERGENCE HERBICIDES REDUCE SOYBEAN YIELD?

Author
item ROREM, KENT - UNIV OF ILLINOIS
item HART, STEPHEN - UNIV OF ILLINOIS
item Wax, Loyd
item BELOW, FREDERICK - UNIV OF ILLINOIS

Submitted to: Soybean Research World Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 5/10/1999
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Glyphosate-resistant soybeans have greatly influenced weed control options to growers. Little is known about potential of glyphosate and other herbicides for injury and crop yield reduction on this type of soybeans. We designed studies to determine the impact of herbicide injury on soybean growth, yield and the interaction with the environment. Field studies were conducted for 2 years at three locations. Various herbicides, applied postemergence, were used at different stages of soybean growth to soybeans planted both early and late. Herbicides used include acifluorfen, imazethapyr and glyphosate. Plots were all kept weed free following application. Parameters measured included crop injury and growth and yield. Weather variables were closely monitored throughout the season. For all planting dates, initial injury appeared with all treatments except glyphosate. Plants recovered from early injury for the most part, with the exception of imazethapyr treated plants, which took longer to recover. In all cases, early planted soybeans did not have yield reductions. In contrast, 3 of 6 late-planted trials showed yield loss ranging from 10 to 22%, which appeared to be related to poor growing conditions following treatment. The data show that certain herbicide treatments often cause early soybean injury, but the plants usually recover with no apparent yield loss. However, if environmental conditions are not favorable for rapid plant recovery, yields may be reduced.