Ana Claudia Alves D’Abadia
Abstract:
Brazil is the world's largest bean producer. Several factors can limit bean yield, such as diseases, however, proper management combined with the use of agricultural inputs can lead to increased productivity. Thus, the objective was to evaluate doses and application times of Booster® biostimulant in three common bean and fungicide cultivars and their application time for the effect of piraclostrobin on pearl bean cultivar. The experiments were installed in a factorial arrangement with three factors, for which nitrate reductase activity, chlorophyll index, height of first pod and plant insertion, disease severity, number of pods per plant and grain per pod were evaluated, mass of one thousand grains and productivity. The cultivar pearl presented higher productivity than the cultivar splendor. The dose of 0.15 L ha -1 reduced the Falker Chlorophyll Index and plant height of the pitanga cultivar. The biostimulant applied in V4 resulted in higher activity of nitrate reductase enzyme, however, without increases in productivity. Regarding the effect of piraclostrobin, the application of Comet® before topdressing increased the nitrate reductase activity, plant height, number of beans per pod, and yield of pearl bean.
