K. Al-khatib et D. Peterson, Soybean (Glycine max) response to simulated drift from selected sulfonylurea herbicides, dicamba, glyphosate, and glufosinate, WEED TECH, 13(2), 1999, pp. 264-270
Field research was conducted to evaluate the response of soybean to various
herbicides applied at rates to simulate drift damage. Dicamba, glyphosate,
glufosinate, and the sulfonylurea herbicides CGA-152005, primisulfuron, ni
cosulfuron, rimsulfuron plus thifensulfuron, and CGA-152005 plus primisulfu
ron were applied to soybean at the two to three trifoliolate leaf stage in
1997 and 1998 at 1/100, 1/33, 1/10, and 1/3 of the recommended use rates. T
he order of yield reduction after herbicide treatment was CGA-152005 > dica
mba > CGA-152005 plus primisulfuron > rimsulfuron plus thifensulfuron > pri
misulfuron. Soybean yields were not reduced by glyphosate, glufosinate, and
nicosulfuron. Applications of all herbicides at rates higher than 1/33, of
the use rate caused injury symptoms within 30 d after treatment. However,
soybean plants had partially or fully recovered by the end of the growing s
eason. Therefore, early-season injury symptoms from herbicide drift are not
reliable indicators for soybean yield reduction.