CULTURA DO MILHO SOB DIFERENTES RECOMENDAÇÕES DE NUTRIENTES E FORMAS DE APLICAÇÃO

Abstract

The form of application and the type of nutrient splitting can contribute to increase productivity in corn crop. The objective of this work was to evaluate the performance of corn under different fertilizer recommendations/plots and application forms. The experimental design used was completely randomized in split plots, with 2 forms of application and 3 recommendations, with 4 repetitions. The plots were the form of application: the broadcast and localized, and the subplots, the recommendations (ADU1, ADU2 and ADU3). ADU1 was 100% P and 50% N and K at sowing, and the other half of N and K, in top dressing. ADU2 consisted of 100% P and 12% and 85% N and K, and the remainder of N and K, in topcoat. ADUB 3 was equivalent to the ADU1 installment plan with omission of phosphorus (0%). The variables evaluated were: first ear height (AP), plant height (AE), stem diameter (DC), ear diameter (DE), ear length (EC), number of ear per plant (NEP), number of grain rows (NFG), number of grains per row (NGPF), 1000 grain mass (MMG) and yield (PROD). Variables AE, CE, NEP, NGPF and MMG were not influenced by the treatments. Only DC showed significant interaction recommendation/installment x application forms with better response for localized ADUB2 and broadcast ADUB1. ADUB2 was 6.5% greater than ADU1 and 17.7% greater than ADU3 in PROD for single factor fertilization/parceling. AP also showed similar behavior. DE and NFG were influenced by the application factor, with higher averages for localized application. The localized application tends to present better productivity response for all tested installments. ADUB1 tends to increase 2.7 sacks/ha than the others when broadcasting and ADUB2 21.9 sacks/ha when located under the conditions of the study.