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EnglishIncorporation of high carbon/nitrogen material, from sugarcane harvested without burn, and new sugarcane cultivars, recomended in the last years, may lead to higher recommendations for nitrogen fertilization. As nitrogen fertilization plays an important role in greenhouse gas emissions, one way to reduce these emissions can be the partial replacement of fertilizers with legumes rotating, with sugarcane. The objective of this work is to establish the recommendation of nitrogen fertilization for sugarcane harvested without burn, and cultivated in rotation with Crotalaria spectabilis. The evaluated treatments are: sugarcane varieties (RB 92579 and RB 867515), rotation with Crotalaria spectabilis, and N rates (0 and 60 kg ha-1 for first cicle and, in two subsequent rattons, 0, 60, 120 and 180 kg N ha-1). The response of sugarcane to Crotalaria rotation and application of 60 kg of N ha-1 is significant, indicating that sugarcane responds to N fertilizer only in the absence of legume. Nitrogen from fertilization results in quadratic response of sugarcane ratoons yield, setting recommended doses of 124 to 146 kg ha-1 of N for high yield materials. portuguesA incorporacao de material de elevada relacao Carbono/Nitrogenio originario da colheita sem despalha a fogo e os novos cultivares de cana-de-acucar podem determinar recomendacoes mais elevadas de adubacao nitrogenada para a cultura. Como a adubacao nitrogenada tem importante papel nas emissoes de gases de efeito estufa, uma forma de diminuir essas emissoes pode ser a substituicao parcial dos fertilizantes por leguminosas, em rotacao com a cana. O objetivo deste trabalho e estabelecer a recomendacao de adubacao nitrogenada para a cana-de-acucar colhida crua e cultivada em rotacao com leguminosas. Os tratamentos avaliados sao: variedades de cana (RB 92579 e RB 867515), rotacao com Crotalaria spectabilis, e doses de N (0 e 60 kg ha-1 para cana planta e, nas duas socarias, 0, 60, 120 e 180 kg de N ha-1). A resposta da cana planta a rotacao com crotalaria e a aplicacao de 60 kg de N ha-1 e expressiva, com a indicacao de que a cana so responde ao N fertilizante na ausencia da leguminosa. O nitrogenio da fertilizacao nitrogenada resulta em resposta quadratica na produtividade de colmos da socaria da cana, estabelecendo recomendacao de doses de 124 a 146 kg ha-1 de N, para materiais de alto rendimento.

Adubação nitrogenada para a cana-de-açúcar colhida crua, em rotação com leguminosas, cultivada em solo de tabuleiro costeiro