Wg. Johnson et al., WEED-CONTROL WITH REDUCED RATES OF CHLORIMURON PLUS METRIBUZIN AND IMAZETHAPYR IN NO-TILL NARROW-ROW SOYBEAN (GLYCINE-MAX), Weed technology, 12(1), 1998, pp. 32-36
Field studies were conducted at three locations in 1993 and 1994 to ev
aluate weed control and crop response to combinations of glyphosate, m
etolachlor, 0.5 x and 1 x label rates of chlorimuron plus metribuzin a
pplied prior Co planting (PP), and 0.5 x and 1 x label rates of imazet
hapyr applied early postemergence (EPOST) or postemergence (POST) in n
o-till narrow-row soybean production, Giant foxtail densities were red
uced with sequential PP followed by (fb) EPOST or POST treatments, Lar
ge crabgrass nias reduced equivalently with all herbicide combinations
involving chlorimuron plus metribuzin PP fb imazethapyr, Common cockl
ebur control was variable but was usually greater with treatments that
included imazethapyr. Ivyleaf morningglory densities were not reduced
with any herbicide combinations. Sequential PP fb EPOST or POST treat
ments tended to provide slightly better weed suppression than PP-only
treatments, but the difference was rarely significant. Soybean yields
with treatments utilizing 0.5 x rates were usually equal to 1 x rates.