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For the cotton crop to have a good establishment in the field, the main management technique needed is fertilization with macronutrients and micronutrients. The objective of the present study was to evaluate the productive performance of Cv cotton. DP 1746 B2 RF cultivated with different doses of nitrogen fertilization in the municipality of Ji-Paraná, Rondônia. The experimental design used was randomized blocks, with four blocks, with treatments consisting of five doses of nitrogen. Planting was carried out in sowing grooves, with a final stand of 8 plants per linear meter. The fertilization of nitrogen cover was carried out according to the doses of each treatment, being divided Brazilian Journal of Development Braz. J. of Develop., Curitiba, v. 6, n. 9, p. 64460-64469, sep. 2020. ISSN 2525-8761 64462 in two times, where the first coverage was at 25 days after the emergence of the plants, and the second coverage 15 days after the first coverage, using the urea as a nitrogen source. The harvest was carried out 180 days after planting. The variables analyzed were: a) number of bolls per plant; b) average mass of a boll (g); c) total seed cotton yield (kg.ha-1) and d) fiber yield (%). For planting the cotton cultivar Cv. DP 1746 B2 RF, nitrogen fertilization had no influence on the boll mass and fiber yield. There was a significant difference for the variables number of bolls per plant and cotton seed yield. The maximum production of bolls per plant and cotton seed yield was obtained with maximum efficiency by the doses of 56 kg.ha-1 and 68.53 kg.ha-1 of N, respectively.

brazilian journal of development

AVALIAÇÃO DA ADUBAÇÃO NITROGENADA NA PRODUTIVIDADE DE ALGODOEIRO CULTIVADO NA REGIÃO AMAZÔNICA / EVALUATION OF NITROGEN FERTILIZATION IN COTTON CROP PRODUCTIVITY IN THE AMAZON REGION