Depth-Resolved Assessment of Soil Fertility in the Indo-Gangetic Plains: Amhat and Bankepur, Sultanpur, with a Focus on N, P, K, and S (Afjal Khan, Pankaj Singh, Alok Kumar Singh, Kumar Anshuman, K. N. Rai, Sarita Devi Gupta, Ankit Singh, & Susheel Kumar Srivastava, Trans.). (2025). International Journal of Scientific Research in Science and Technology, 12(5), 156-167. https://doi.org/10.32628/IJSRST25125117