Fontes de boro no metabolismo e produtividade da soja

Abstract

Boron (B) is essential for soybeans due to its benefits in the metabolism and yield of the crop. Generally, its content is low in tropical soil, which can cause deficiencies and reduced yield. Therefore, each crop needs an adequate supply of boron. The research hypothesis is that boron sources applied via foliar can increase water use efficiency and soybean yield. Therefore, the research aims to evaluate different sources of B applied via foliar and their effects on gas exchange, water use efficiency, and yield. The experimental design used was a completely randomized plot with five sources of boron (1 = control, 2 = boron Mix, 3 = UltraB, 4 = octaborate, and 5 = boric acid) applied to soybean leaves, with five replications. In the experiment, only one plant was used per pot, with a plot volume of 8 dm3. In this research, the number of pods per plant, grains per pod, grain classification, number of nodes present on the main stem, mass of 1.000 grains, yield per plant, photosynthesis, transpiration, water use efficiency, and the dry mass of the stem and leaves. We conclude that foliar application using Boro Mix, UltraB, and boric acid increased the efficiency of soybean yield and water use.