USOS DE ÁCIDO HÚMICO E PROTETOR SOLAR NA CULTURA DA MANDIOCA

Abstract

Cassava is a crop of economic and nutritional importance because it participates in the diet of millions of people around the world. The crop faces the challenge of increasing its world productivity, which has a world average of 11.2 t ha-1, but has the potential to exceed 80.0 t ha-1. Studies in other cultures demonstrate that the use of biostimulants activate physiological processes responsible for lateral roots, providing vegetative growth and greater productivity. Sunscreen contributed to lower evapotranspiration, due to decreased sunlight and leaf temperature. The objective of this research was to evaluate the effect of the foliar application of humic acid and sunscreen in the cassava crop. The experiment was carried out at the Federal University of Mato Grosso do Sul, Chapadão do Sul campus. The experimental design was randomized blocks with six treatments and four replications. The treatments were biological by: control, 0.5 kg ha-1 AH, 1.0 L ha-1 PS, 0.8 kg ha-1 AH, 0.5 AH + 1.0 PS and 0.8 AH + 1.0 PS. The foliar application was carried out after four months of planting the stems. On the day of harvest, stem diameter, shoot biomass, number of commercial roots, root length, root diameter, productivity and harvest index are evaluated. The treatment with 800 g ha-1 of humic acid associated with 1000 g ha-1 of sunscreen was superior to the other treatments in relation to the number of commercial roots, root diameter, productivity and harvest index.