PRODUÇÃO DO FEIJOEIRO COMUM EM FUNÇÃO DA APLICAÇÃO DE NITROGÊNIO (DMPP) CULTIVADO EM SISTEMA IRRIGADO

Abstract

The use of adequate management practices and increased nitrogen doses have contributed to increase productivity of common bean grains (Phaseolus vulgaris); however, there are few studies about irrigated crops in the Cerrado region (Brazilian savannah), reporting the interference of the use of N doses at sowing, cover, and installments at sowing and cover. The objective of this study was to evaluate the effect of different doses of slow release nitrogen [Dimethylpyrazole (DMPP)] on sowing, on covering and on plotting on sowing and cover, on agronomic performance, and on leaf area index (LAI) of irrigated common bean plants in the Cerrado region. Randomized block design was used in a 4 x 3 factorial scheme [four N doses (0, 60, 120, and 180 kg ha-1 ), three application forms (total in sowing, total in cover and 50% in sowing, and 50% in cover], and irrigation management (class A tank) with four replicates. The irrigation shift was two days. The N applied to bean plants at different stages of the culture did not interfere with the production components. The maximum grain yield reached 1,756.37 kg.ha-1 with the dose of 180 kg.ha-1 in the harvest of 2015; and 123.98 kg.ha-1 with the dose of 123.98 kg.ha-1 in the harvest of 2016, under the soil and climate conditions of the Ceres-GO region