Gava, G.J. de C. et al. 2005. Urea and sugarcane straw nitrogen balance in a soil-sugarcane crop system. Pesquisa Agropecuaria Brasileira. 40, 7 (Jul. 2005), 689–695. DOI:https://doi.org/10.1590/S1678-3921.pab2005.v40.7013.