JAGGI, R C. Sulphur levels and sources affecting yield and yield attributes in onion (Allium cepa)*. The Indian Journal of Agricultural Sciences, Delhi, India, v. 75, n. 3, 2005. Disponível em: https://epubs.icar.org.in/index.php/IJAgS/article/view/9335. Acesso em: 27 oct. 2025.