Fageria, Nand Kumar, and Francisco Jose Pfeilsticker Zimmermann. “Irrigated Rice Response to Fertilization on Lowland Soils”. Pesquisa Agropecuaria Brasileira, vol. 31, no. 6, June 1996, pp. 463-6, doi:10.1590/S1678-3921.pab1996.v31.4505.