The reduction of foliar area can cause yield reduction in common bean crops.\nThe objective of this work was to verify which is the effect of different defoliation\nlevels realized in several development stages of common bean (Phaseolus\nvulgaris L. cv. Goytacazes) over yield, weight of 100 seeds and number of\npods per plant. The experimental design was randomized blocks, in a\nsplit-plot arrangement with five replications. The plot corresponded to the\nfive defoliation epochs (first trifoliate leaf, flowering, pods formation, pods\nfilling, and dry pods). In each plot, the split plot was represented by the four\ndefoliation levels (0%, 33%, 67% and 100%). It was observed a decrease of\nyield for all levels defoliation considering all development stages, except for\ndried pods. The highest decrease was detected for flowering and pods formation.\nThrough the regression analysis got a greater reduction in yield with\n100% defoliation made at 42 days after emergence. The evaluation parameter\nthat showed better relation with yield was a number of pods per plant.
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