TITLE:
Artificial Defoliation to Simulate Losses on Production of Bean (Phaseolus vulgaris L. cv. Goytacazes)
AUTHORS:
Omar Schmildt, Vinicius de Souza Oliveira, Dirceu Pratissoli, José Augusto Teixeira do Amaral, Marcio Paulo Czepak, Adriel Lima Nascimento, Edilson Romais Schmildt
KEYWORDS:
Common Bean, Defoliation, Grain Productivity, Mass of Seeds, Pods
JOURNAL NAME:
Agricultural Sciences,
Vol.10 No.8,
August
12,
2019
ABSTRACT: The reduction of foliar area can cause yield reduction in common bean crops. The objective of this work was to verify which is the effect of different defoliation levels realized in several development stages of common bean (Phaseolus vulgaris L. cv. Goytacazes) over yield, weight of 100 seeds and number of pods per plant. The experimental design was randomized blocks, in a split-plot arrangement with five replications. The plot corresponded to the five defoliation epochs (first trifoliate leaf, flowering, pods formation, pods filling, and dry pods). In each plot, the split plot was represented by the four defoliation levels (0%, 33%, 67% and 100%). It was observed a decrease of yield for all levels defoliation considering all development stages, except for dried pods. The highest decrease was detected for flowering and pods formation. Through the regression analysis got a greater reduction in yield with 100% defoliation made at 42 days after emergence. The evaluation parameter that showed better relation with yield was a number of pods per plant.