Freire, C.J. da S. and Anguinoni, I. 2014. Nutritional status of apple orchards in Rio Grande do Sul and Santa Catarina, Brazil. Pesquisa Agropecuaria Brasileira. 22, 4 (Apr. 2014), 373–380. DOI:https://doi.org/10.1590/S1678-3921.pab1987.v22.14348.