SHETH, N. T.; DESAI, J. K.; PATODIYA, M. M.; BHATT, N. S.; DUGGIRALA, S. M. Field scale comparative study on application of DAP, Urea and Humic acid on soil flora and crop productivity. Vidyapith (વિદ્યાપીઠ), [S. l.], v. 53, n. 4, p. 17–31, 2015. Disponível em: http://journal.gujaratvidyapith.org/index.php/vp/article/view/61. Acesso em: 15 oct. 2025.