Efeito de diferentes fontes de nitrogênio na produção de repolho

Abstract

Cabbage is the most important crop of Brassicaceae families in horticulture, because for its good development it needs the supply of nutrients. Nitrogen stands out, being complemented by reserve only through fertilization. The three nitrogen fertilizers most used in Brazil are urea, ammonium sulfate and ammonium nitrate, which can be lost by volatilization, leaching and denitrification, in addition to their application not only, leading to reduced production and increased production cost. In this context, the experiment aimed to evaluate the effects of different nitrogen sources on cabbage production. The experiment was conducted on a rural property in the municipality of Realeza-PR, from December 2021 to March 2022 with the cabbage cultivar Anzu. The experimental design used was that of blocks, with 20 plots of 6.4 m² (3.2 x 2 m) with 4 treatments, consisting of control, urea, ammonium sulfate and ammonium nitrate, with 5 replications. The evaluation of the foramen carried out during the harvest, or complete cycle was of 108 days, the components were evaluated: fresh mass of the head, longitudinal and transversal diameter and productivity of the cabbage heads. With the results found, it was identified that the nitrogen sources showed no differences. However, the most recent treatment was the one that presented the lowest productivity, fresh mass and cross-section diameter, probably due to limitations generated by the lack of nitrogen, since the nitrogen sources presented the same results and it is recommended to opt for lower-priced fertilizers per nitrogen unit.