BIOESTIMULANTES E PROTETOR SOLAR NA PROMOÇÃO DE SUSTENTABILIDADE NO CULTIVO DA SOJA

Abstract

Soy is one of the most commercially important crops in Brazil and achieves high productivity, which is why there is a demand for the use of more sustainable products, capable of promoting regenerative agriculture, such as biostimulants and sunscreen. Thus, the objective of this work was to evaluate soybean growth and productivity characteristics depending on the use of biostimulants and sunscreen. The experiment was installed at the Federal University of Mato Grosso do Sul, Chapadão do Sul campus in a randomized block design with six treatments and four replications. The treatments consisted of control without application of humic substances and sunscreen, sunscreen 1 L ha-1 (PS), humic substance 500 g ha-1 (SH500), sunscreen 1 L ha-1 (PS) with humic substance 500 g ha-1 (SH500), humic substance 750 g ha-1 (SH750) and sunscreen 1 L ha-1 (PS) with humic substance 750 g ha-1 (SH750). The products were applied as foliar spray at the V5/6 growth stage. At harvest, growth characteristics, production components and soybean grain productivity were evaluated. Using SH500 and PS+SH750 increased the total height of the plant, which was 4.6 cm above the valueobtained by the control. These same products also provided a 12.9% gain in the number of branches when compared to the control. For the mass of one thousand grains there was an increase of 6.3% when using PS+SH750 and grain productivity increased by 12.9% or 9.8 bags in relation to the control, when using SH500 and PS+ products. SH750. Respectively, the use of sunscreen alone contributed only to the number of pods per plant and grain mass per plant, but when it was associated with humic substance, it participated in the improvement of all variables studied. The use of the humic substance at the highest dose, 750 g ha-1, was not favorable for any variable, indicating that higher doses are not appropriate. The use of a dose of 500 g ha-1 was favorable for all variables, except thousand grain mass. The use of sunscreen and humic substance are favorable for improving the growth characteristics, production component and productivity of soybeans.