Aplicação de uréia em duas cultivares de soja de ciclo precoce e superprecoce

Abstract

The use of Nitrogen via fertilization on soybean is controversial. Several authors advocate the non-use by the fact of biological nitrogen fixation to be able to meet this demand. To analyze responses of nitrogen application via urea topdressing was conducted an experiment with two cultivars of soy Nidera Seeds: NS5858 and NS7200 of very early and early cycles, respectively. We used five nitrogen levels (0, 15, 30, 45 and 60 kg.ha-1 of nitrogen) applied between the lines of the essay at the beginning of flowering. The attributes evaluated were productivity, plant height, height of the first insertion pod, weight of thousand seeds and evaluation of oil and protein contents of seeds. The results showed that: there was no statistical difference in productivity for both cultivars; increasing doses of nitrogen caused a downward trend in oil content in the cultivar NS 7200; nitrogen rates used in this experiment did not cause a statistically significant difference for the attributes plant height, height of the first pod, thousand grain weight, protein content for both cultivars and oil content just for the NS 5858 cultivar.