JOSHI, O P; BILLORE, S D. Economic optima of sulphar fertilizer for soybean (Glycine max). The Indian Journal of Agricultural Sciences, Delhi, India, v. 68, n. 5, 2013. Disponível em: https://epubs.icar.org.in/index.php/IJAgS/article/view/27490. Acesso em: 22 jun. 2026.