ADAK, TARUN, G. PANDEY, VINOD KUMAR SINGH, and S. RAJAN. 2019. “Assessing Soil Nutrient Index in Mango Orchards of Maal Area, Lucknow, U.P”. Journal of Soil and Water Conservation 18 (3). https://epubs.icar.org.in/index.php/JSWC/article/view/107841.