Chaves, Lucia Helena Garófalo, and Marcelo Miná Dias. “Forms of Potassium in Regosol of the State of Paraíba, Brazil”. Pesquisa Agropecuaria Brasileira 31, no. 7 (July 1, 1996): 523–528. Accessed July 6, 2026. https://apct.sede.embrapa.br/pab/article/view/4514.