SAT PAL SAINI*, Shreyansh Mittal and. Evaluation of Nutrient Index using Manganese as a Measure of Fertility Status of Soils under Different Cropping Systems of Punjab in North-Western India. Journal of the Indian Society of Soil Science, India, v. 68, n. 4, 2021. Disponível em: https://epubs.icar.org.in/index.php/JISSS/article/view/110853. Acesso em: 20 oct. 2025.