02139naa a2200253 a 450000100080000000500110000800800410001902200140006002400490007410000230012324501010014626000090024752013830025665300260163965300180166565300330168370000200171670000230173670000130175970000140177270000160178670000210180277300620182320703262017-06-02       2017    bl uuuu     u00u1 u    #d  a1678-44997 ahttp://dx.doi.org/10.1590/1678-4499.1862DOI1 aOLIVEIRA, A. P. P.  aAgronomic performance of green cane fertilized with ammonium sulfate in a coastal tableland soil  c2017  aThe recent approach of eliminating the usage of fire for sugarcane harvesting resulted in managing the crop on a trashblanketed soil, to which a proper recommendation of N fertilization is lacking, a problem that remains in the coastal tablelands of the Espírito Santo State, Brazil. This study aimed at evaluating the effect of increasing N rates on stalk and sugar yields and the N use efficiency by the crop. The experimental area planted with sugarcane, at the first ratoon, is located in Linhares, Espírito Santo State. The treatments consisted of N rates varying from 80 to 160 kg N∙ha−1 as ammonium sulphate, and a control without N, in a completely randomized blocks experimental design. Stalk yield increased with the N rate, and fitting the results to a quadratic function suggests no response to fertilizer rates above 130 kg N∙ha−1. The highest margin of agricultural contribution was obtained at the rate of 100 kg N∙ha−1. The N use efficiency decreased from almost 49 to 38%, when the N rate increased from 100 to 160 kg N∙ha−1. There was no effect of increasing N rates on the sugar concentration, although the sugar yield response was positive and strongly influenced by the stalk production. Results showed the importance of reassessing the adequate N rate for maximizing yield in green cane production systems.  aNitrogen requirements  aSaccharum spp  aSugarcane harvesting systems1 aALVES, B. J. R.1 aANJO, L. H. C. dos1 aLIMA, E.1 aZONTA, E.1 aPEREIRA, W.1 aSOARES, P. F. C.  tBragantiagv. 76, n. 2, Apr./Jun. 2017 Epub May 15, 2017.