Tadeu Silva de Oliveira, Rogério de Paula Lana, Geicimara Guimarães and José Gilson Louzada Regadas Filho 2011. EFFICIENCY AND INTERACTION AMONG NUTRIENTS IN CROP PRODUCTION IN COTTON, BEANS, SOYBEAN AND WHEAT. Brazilian Journal of Sustainable Agriculture. 1, 1 (Jul. 2011). DOI:https://doi.org/10.21206/rbas.v1i1.18.