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Effect of preemergence application of some herbicides on nodulation nitrogen fixation and growth of soybean glycine max cultivar clark



Effect of preemergence application of some herbicides on nodulation nitrogen fixation and growth of soybean glycine max cultivar clark



Pesquisa Agropecuaria Brasileira 16(6): 833-840



Aretit at the recommended rate (XI) and treflan, especially at high concentration (x 5 folds), stimulated nodulation of soybean 'Clark', while planavin, cobex or linuron, especially at high concentration inhibited nodule formation and even, in some instances, prevented plant growth. In all herbicidal treatments, the dry matter content of whole plant on the 2nd harvest (92 days or pod filling) was lower, even those which showed stimulation at the 1st harvest (49 days or full bloom) than the control; the yields of pods obtained on maturity were also lower. In general, total-N contents of shoots, roots and pods as well as yield of total-N seemed to be affected by the application of herbicides. The effect differed according to herbicides concentration and growth stages of the plant. Nitrogenase activity as a measure of biological fixation of atmospheric N using the acetylene-reduction technique was also carried out for root nodules to investigate effect of aretit or treflan on the symbiotic N-fixation processes. Dehydrogenase activity in nodule homogenate was also determined in presence or absence of succinate, citrate or ethanol to investigate the effect of herbicidal treatments on respiratory chain of bacteroids. This was done to determine the effect of herbicidal treatments on the capacity of the legume plant (soybean 'Clark') to supply the symbiont (Rhizobium japonicum) in the root nodules with some products (H doners) of the Kreb's cycle thus affecting N fixation efficiency of root nodules.

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