BISWAS, D.R. Soil Testing for Balanced Fertilization: technology–application–problems–solutions. Journal of the Indian Society of Soil Science, India, v. 62, n. 4, 2015. Disponível em: https://epubs.icar.org.in/index.php/JISSS/article/view/47191. Acesso em: 25 oct. 2025.