IDENTIFY CHEMICAL METHOD TO REDUCE TOXICITY OF GLYPHOSATE IN CROP PLANTS – MAIZE AND SOYBEAN
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Date
2014-08-15
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University of Agricultural Sciences, Bangalore
Abstract
Accidental application of glyphosate or to save the endangered species in forest flora and fauna from glyphosate is an important issue. Glyphosate is an ideal herbicide and divalent cations viz., Fe, Ca, Mg, Cu, Zn, and Mn act as chelating agents which are present in hard water and thus reduce the efficacy of glyphosate. Divalent cations bind to glyphosate and thus make glyphosate not available for penetration, translocation and reduces the concentration at the site of action. Attempts were made to identify, efficient concentration, time of application of best anti-glyphosate agents in reducing the efficacy of glyphosate in corn and soybean plants. Amongst anti-glyphosate agents viz., sulphates of Fe, Zn and Ca, FeSO4 at 1 % that is 3 h after glyphosate spray show to reduce glyphosate efficacy in terms of higher total chlorophyll and more biomass of maize compared to glyphosate alone but less than control plants. Maize seed priming with FeSO4 (0.5 %) has negated the effect of 0.33 Kg a.i ha-1 glyphosate. However such an effect was not observed in soybean. Soybean seems to be more sensitive than maize. In different source of water Fe++ content was least concentrated than Zn, Mg, Ca and much less than effective concentration needed for antiglyphosate action. Negating effect of glyphosate by Fe++ cations was observed in maize for a short period of ten days.
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