Adubação foliar com boro em diferentes estádios fenológicos da soja

Abstract

Boron is a nutrient that plays important functions in the plant, being connected in the movement of sugars, germination of the pollen grain and development of the pollen tube, acting in the retention of flowers and consequently formation of pods. However, it presents low mobility in the plant via phloem. In this sense, the objective of this study was to evaluate the components of soy production as a function of foliar application of boron in different soybean phenological stages, (Glycine max). The experiment was conducted in the field from September 2017 to February 2018. The experimental design was in randomized blocks (DBC) with seven application times of B: (Control, 100% V4, 100% R1, 100% R3, 50% V4 + 50% R1, 50% V4 + 50% R3 and 50 % R1 + 50% R3) and four replicates totaling 28 experimental units. Agronomic attributes were quantified (number of pods per plant, number of grains per plant, number of grains per pod, boron content in the plant, weight of one thousand seeds, productivity, number of flowers and pocketknives). The averages of the agronomic variables differed with the application of boron. Since, the foliar application increased the levels of B in the plant. The foliar applications at the reproductive stages (R1 + R3) presented the best results of pod glue. Boron application did not increase productivity.