APLICAÇÃO FOLIAR DE SILÍCIO PARA INDUÇÃO DE RESISTÊNCIA EM HÍBRIDOS DE MILHO SEGUNDA SAFRA

Abstract

Maize is one of the most widely grown cereals in Brazil, its economic importance due to its uses and significant impact on food and energy production. Inducing resistance is a strategy aimed at activating latent defense mechanisms in host plants, whether they are susceptible or moderately resistant. The aim was to evaluate the agronomic and production characteristics of maize hybrids subjected to different forms of foliar application of a resistance inducer. The experiment was carried out in Nova Glória (GO), Brazil. The design used was randomized blocks in a 2x7 factorial scheme, two hybrids (P 3858PWU and MG 30A37PWU) and seven ways of applying the inducer, T1 - control, T2 - one application with the first dose of fungicide (750 mL + 300 mL ha- 1), T3 - two applications with fungicide (750 mL + 300 mL ha-1 each application), T4 - two applications of fungicide (600 mL + 300 mL ha-1 each application ), T5 - one application of the second dose of fungicide (750 mL + 300 mL ha-1), T6 - one application of the first dose of fungicide (600 mL + 300 mL ha-1) and T7 - one application of the second dose of fungicide (600 mL + 300 mL ha-1), with four replicates. The results showed significant differences between the hybrids for variables such as plant height (2,37m), first ear height (1,34m) and ear diameter (49,2mm), with P 3858PWU showing the greatest agronomic potential. One application of the inducer with the second of the fungicide at a dose of 750 mL + 300 mL ha-1, at stage V5, promoted a 5% increase in yield, with 6534,46 kg ha-1. The use of inducers can be strategic in scenarios of greater environmental stress, favoring the sustainability of the corn crop.