Efeito da aplicação antecipada da adubação nitrogenada em pré-semeadura de milho

Abstract

The most nitrogen data in the culture of the culture, in the most must be used in the culture of organic cyclic organic growth, and their benefits in the organic microbiana as growth biotity in the growth of biodiversity, carbon addition. The present work aims to verify the nutritional status of the maize crop (Zea mays) submitted to the anticipation of nitrogen fertilization. The experiment was conducted at the IAPAR experimental station, in the Pato Branco Regional Pole, under a randomized block experimental design, in a 2x2 factorial scheme, in subdivided plots, with four replications. The component factor of the plot was the anticipated dose of nitrogen (0 and 150 kg ha−1 N) anticipated pre-sowing of maize under black oats (Avena strigosa). In the sub-plots doses (0 and 150 kg ha -1 N) of nitrogenous nitrogen fertilization were allocated in the V6 stage of culture (V6). The hybrid used was Balu 280 Pro, and base fertilization with 150 kg ha−1 of formulated 12-31-17 (18kg ha−1 N, 46.5 kg ha−1 of P2O5 and 25.5 kg ha−1 of K2O). The samplings were performed until flowering in the form of cuts of the total aerial part at 30, 37, 44, 51, 58, 69 days after emergence of the plants. The samples were then dried in an oven at 55oC and weighed to determine the accumulation of dry matter. Afterwards, they were milled in a Willey type mill in a 2mm sieve and sent to the laboratory to determine the N, P and K contents in the aerial part. It is observed by means of the dilution curve and nitrogen nutritional index that the plants submitted to a dose of 150 kg ha−1 in Pre-sowing, presented satisfactory nutritional status, without limitations to the development of the plants. In relation to the nutritional index of P, it was observed that the growing environment had limitations for the development of the plants, and when submitted to zero doses, the plants presented better nutritional status, compared to when they received dose. It is concluded that the anticipation of nitrogen fertilization is an efficient way to manage. Dilution curves and nutrient index are efficient tools for maize decision making.