Effect of Different Sources and Doses of Nitrogen on Vegetative and Productive Performance of Sugarcane under a Dystrophic Red Latosol Condition

The aim of this work was to evaluate the effects of the application of different sources and doses of nitrogen (N) in the growth and productivity of sugarcane in cane plant. Field experiments were conducted in the area of Rio Paraiso II farm, belonging to the Raízen factory, in the city of Jataí, GO. The soil was classified as dystrophic red latosol. The experimental design used was in randomized block, analysed in factorial scheme of 2 × 4 × 4, with three replications. The factors analysed were two sources of N (urea and ammonium nitrate), four doses of N (0, 60, 120 and 180 kg/ha) and four evaluation times (210, 250, 290 and 330 d after planting (DAP)). The parameters analysed were plant height (PH), diameter of stalks (DS), length of internodes (LI) and productivity of stalks (PS). Results observed significant difference in the sources and doses of N for the evaluated parameters in sugarcane plant. Urea in the average doses of 110 kg/ha and 100.87 kg/ha provided the greatest PH and LI of sugarcane, respectively. Ammonium nitrate at a dose of 180 kg/ha presented the largest DS of sugarcane (cane plant) at 330 DAP. The PS of sugarcane SP80-1816 at 60 kg/ha and 120 kg/ha ammonium nitrate has higher increments. For the PS, it is recommended the application of doses between 60 kg/ha and 120 kg/ha of N of the source ammonium nitrate in sugar cane (cane plant).