ÉPOCAS DE SEMEADURA DE HIBRIDOS DE MILHO NA SAFRINHA E SUAS IMPLICAÇÕES NO USO DE NUTRIENTES E PRODUTIVIDADE

Abstract

Corn is a global crop and has a major economic impact in Brazil. The agronomic characteristics and performance of different hybrids vary depending on the time that they are sown and related conditions. The objective of this study was to evaluate the performance of ten corn hybrids sown at different sowing times in the second crop (February 8, February 20, and March 6) in two locations. The variables analyzed were: plant height, ear insertion height, rotten stalk, grain relative moisture, grain yield, macro and micronutrient content in grains, export, and nutrient use efficiency. The hybrids were evaluated within each sowing season using ANOVA, comparison of means; The multivariate principal component method was used to evaluate the differences between sowing dates. There were significant differences between hybrids, sowing dates, and hybrid x date interaction for some variables. The MG593PWU hybrid was the most productive, followed by the FS575PWU hybrid, with greater efficiency in the N and K use, but with lower levels and export of N in the grains.