Sheth, N.T. (2015) “Field scale comparative study on application of DAP, Urea and Humic acid on soil flora and crop productivity”, Vidyapith (વિદ્યાપીઠ), 53(4), pp. 17–31. Available at: https://journal.gujaratvidyapith.org/index.php/vp/article/view/61 (Accessed: 26 August 2026).