Siqueira, J. O., Geraldo A.A. Guedes, and Marco A.V. Ribeiro. “Availability of the Potassium of Nephéline Sienite from Poços de Caldas, Evaluated through Successive Croppings With Corn”. Pesquisa Agropecuaria Brasileira 20, no. 3 (April 17, 2014): 299–307. Accessed October 14, 2026. https://apct.sede.embrapa.br/pab/article/view/15124.