APLICAÇÃO DE BIOESTIMULANTES E FERTILIZANTES FOLIARES NA CULTURA DA SOJA

Abstract

This study aimed to evaluate the effect of fertilizer application sprayed in the sowing furrow and via foliar application at different stages of soybean development on germination, photochemical efficiency, growth and productivity of soybean. The experimental design was in strips with seven treatments (T1 - Control; T2 - Biozyme® via foliar application at V4, T3 - at R1, T4 - in sowing furrow treatment (TS) and R1; T5 - K-fol® at R5.1; T6 - Raizal® at V3 and T7 - ​​Foltron® + Herbicide at V4). The applications were made with a CO2 pressurized sprayer with a pressure of 2.5 kgf cm-2 at the spray bar, and a fan-type nozzle tip with a 110º angle Adia 0.2 from Magnus®. The agronomic germination, seedling emergence, growth in the vegetative stage V4-V5 and in R1, flowering, chlorophyll “a” fluorescence in V4 to V5 and soybean grain yield were evaluated. There were biometric changes with the applications of Biozyme® in TS/R1 and only in R1 and with Raizal® in V3. With the application of Foltron® together with glyphosate in post-emergence in the V3 stage of soybean, an increase in the photochemical efficiency of the plant, in the weight of a thousand grains and consequently the greatest increase in productivity was obtained. With the results obtained and for the conditions of performance of this work, it is concluded that the application of Foltron® in V3 and Biozyme® in R1 provided greater photochemical efficiency and grain yield of soybean.