A preliminary study of soybean genotype responses to glyphosate
Marinov-Serafimov, P., Institute of Forage Crops, Pleven (Bulgaria)
The objective of this study was to determine and compare the sensitivities of different soybean genotypes to glyphosate under greenhouse conditions. Eight newly-developed Bulgarian lines, varieties and candidate varieties of soybean were included in the trial. The effect of four application rates of glyphosate (Roundup, 360 g a.i./l) - 180; 360; 720 and 1440 g a.i./ha on the survival, dynamics of growth, and accumulation of fresh biomass in g per plant was studied. The studied soybean genotypes showed different levels of glyphosate sensitivity due to their genetic differences. The depression coefficients (B) of the studied characteristics depended mainly on soybean genotypes and the applied herbicide rates. The tested glyphosate rates showed a high (GL 26.5-51.6%) to relatively low degree of toxicity (Gl 16.0-18.7%) in the studied soybean genotypes.
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