Fontes e parcelamento da adubação nitrogenada na cultura do milho

Abstract

The Corn has great economic and nutritional importance, generating income to producers and has great use for human and especially animal feed. Moreover, corn cultivation has great benefits for the no-till system and is an essential crop for this system. Nitrogen application is directly linked to corn yield, being the essential nutrient for the crop, because without it is not possible to reach high yields. The objective of this work is to evaluate the yield of corn under application of different sources of nitrogen fertilization in coverage and the installment of them, as well as to evaluate the economic viability with the application of nitrogen sources. The experiment was carried out in the agricultural year 2018/2019 in Cerro Largo - RS, at oxisols, with a randomized block design with 5 x 4 meters plots with 4 replications. The treatments consisted of different sources of nitrogen applied in the corn crop, being urea, urea with inhibitor of urease NBPT and ammonium nitrate, where they were applied in single and split doses. The 3 nitrogen sources were evaluated, making the evaluations from the plant height and ear insertion, thousand grain weight, productivity and economic viability. The treatments where the highest yield was obtained was where nitrogen application was applied in coverage, differing statistically from where there was no application of nitrogen in coverage. The most viable treatment with the highest net revenue was the first urea application and the second urease inhibitor application of urea, followed by the single dose urease inhibitor treatment