Adubação boratada via solo e suplementação via foliar incrementam produtividade da soja

Abstract

Deficiency or excess of boron promotes metabolic and physiological changes in plants, harming productivity. Thus, the objective was to evaluate the effects of soil B doses associated with foliar B supplementation on soybean yield components and yield. The experiment was carried out in the experimental area of the Federal University of Mato Grosso do Sul, Chapadão do Sul campus, in the 2020/2021 harvest. The experiment was cultivation in randomized blocks, with 10 treatments, with 5 doses (0, 1, 2, 4, 6 kg ha-1 of B) using Ulexite x 2 (absence and presence of B via foliar 100 mL of B ha-1

) and 4 repetitions. At the stage of full maturation R9, harvest was carried out, after harvest the following parameters were evaluated: plant pods-1 , pod-1 grains, flat pods, weight of 100 grains and yield, with grain moisture corrected to 13 %. The treatment AF2 (Foliar Application + 2 kg ha-1 of B) was the most efficient in increasing grain yield (PROD), pods with three grains (V3) and total pods (VT) in soybean. The extreme doses of B, being 0, 1, and 4, 6 Kg ha-1 , which regardless of whether they have foliar application or not, distance themselves from the agronomic variables of productive interest, with a tendency to approximate the flat grain factors (Chocho) and pods with one grain (V1). According to this work, the recommended B dose would be 2Kg ha-1 of B associated with B supplementation via the leaves.