R.K. RATTAN AND A.K. SINGH, B.C. Verma, S.P. Datta. Long-Term Effect of Tillage, Water and Nutrient Management Practices on Mineral Nitrogen, Available Phosphorus and Sulphur Content under Rice-Wheat Cropping System. Journal of the Indian Society of Soil Science, India, v. 64, n. 1, 2016. Disponível em: https://epubs.icar.org.in/index.php/JISSS/article/view/58738. Acesso em: 6 jun. 2026.