TITLE:
Evaluation of Biostimulants Added to Post Emergence Herbicides in Soybean
AUTHORS:
Nader Soltani, Christy Shropshire, Peter H. Sikkema
KEYWORDS:
Herbicide, Injury, Soybean, Tolerance, Weeds, Yield
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.7 No.13,
September
16,
2016
ABSTRACT: There is little information on
the effect of the addition of biostimulants such as AX13-04-4, Crop Booster or RR Soy Booster to post emergence
herbicides in soybean under Ontario
environmental conditions. A total of 69 field experiments were conducted in soybean at two
locations (Ridgetown and Exeter, Ontario, Canada) to evaluate the effect of
biostimulants added to various post emergence herbicides on crop injury, weed
control and yield of soybean. There was minimal soybean
injury (6% or less) from glyphosate, chlorimuron, imazethapyr, fomesafen or
quizalofop applied alone or in combination with biostimulants. At 4 weeks after herbicide treatment (WAT), the addition of biostimulants to glyphosate, chlorimuron,
imazethapyr, fomesafen or quizalofop did not affect weed control except for
control of common ragweed which was increased 2% with the addition of RR Soy Booster
to glyphosate + imazethapr, and the control of common lambs quarters which was
increased 4% with the addition of Crop Booster to glyphosate + fomesafen. At 8
WAT, biostimulants evaluated had no effect on weed control except for Crop
Booster added to glyphosate + fomesafen which increased green foxtail control
2% and Crop Booster added to glyphosate + chlorimuron, glyphosate + fomesafen
and glyphosate + quizalofop which increased common lambs quarters control 1%,
3%, and 4%, respectively. The addition of biostimulants to the
post emergence herbicides evaluated had no effect on soybean yield. Based on
these results, the addition of biostimulants such as AX13-04-4, Crop Booster or RR Soy Booster
to commonly used post emergence herbicides in Ontario has no significant effect
on crop injury, weed control or yield of soybean.