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The radish (Raphanus sativus L.) has been outstanding for being a fast cycle crop, besides being a good income alternative for the rural producer, has an excellent nutritional content, over the years has been growing the production area in Rondônia , but there is still a lot of information on the management of this crop, mainly in terms of fertilization. The objective of this study was to evaluate two sources of nitrogen fertilization by testing increasing doses. The experiment wasinstalled in the experimental Campus of the Agronomy course of the Federal University of Rondônia (UNIR) in the municipality of Rolim de Moura. The experimental design was a randomized block in 2 x 5 subdivided plots, with three replications. The main plot consisted of two sources of nitrogen fertilization (Urea 45% N and calcium Nitrate 15% N) and the subplots represented the (0; 25; 50; 100; 200 kg ha) was applied to the giant Crimson radish cultivar at sowing occurred on August 15, 2017. The variables analyzed were plant height, number of plants leaves, fresh shoot mass and productivity. The fertilizer sources did not obtain a significant effect, however, the increasing doses in all variables analyzed had a behavior where a quadratic polynomial model was found, with a maximum dose of 120 kg ha for radish productivity.

APLICAÇÃO DE DUAS FONTES DE ADUBAÇÃO NITROGENADA SUBMETIDA A DOSES CRESCENTES NA CULTURA DO RABANETE (Raphanus sativus L.) NA AMAZÔNIA OCIDENTAL