AHMED, S.; JHA, K.K. Sulphur Requirement of Crops in Bihar . Journal of Soil and Water Conservation, India, v. 18, n. 1 & 2, 2022. Disponível em: https://epubs.icar.org.in/index.php/JSWC/article/view/127294. Acesso em: 3 jul. 2026.