Installments and doses of nitrogen fertigated into the corn crop - DOI: 10.7127/rbai.v1901384

Resumo

The aim of the study was to evaluate the impact of different forms of nitrogen installment and doses via fertigation on the corn crop in a semi-arid climate. The experiment was carried out in the field using the maize crop (Zea mays L.) hybrid AG 1051, with a randomized block design with four replications and treatments arranged in a factorial scheme (3x5), consisting of three forms of nitrogen dose installment (P1, P2 and P3) associated with five doses of nitrogen (D1 - control, D2 - 50, D3 - 100, D4 - 150 and D5 - 200% of the recommended dose, respectively 0, 85, 170, 255 and 340 kg ha-1). The irrigation system was localized drip irrigation with daily irrigations to replenish the ETc and the nitrogen source used was urea. Vegetative and production variables were assessed: Dry mass of the aerial part of the plant (MSPAP); Ear mass with straw (MESPCP); Ear mass without straw (MESPSP); 100-grain mass (M100G). The variables MSPAP, MESPCP and MESPSP were only influenced by the doses of N, while MP was not influenced and M100G showed a significant interaction between the treatments.