Malavolta, E., and A. M. L. Neptune. “ Increasing the Efficiency of Utilization of Soil and Fertilizer Phosphorus in the Subtropical and Tropical Agricultural Systems C ”. Anais Da Escola Superior De Agricultura Luiz De Queiroz, vol. 40, no. 2, Jan. 1983, pp. 825-63, https://doi.org/10.1590/S0071-12761983000200009.