SINGHA, D D; SINGH, ANOOP; GUPTA, A P. Nitrogen transformation in sewage-sludge amended soil as influenced by addition of zinc,cadmium and nickel. The Indian Journal of Agricultural Sciences, Delhi, India, v. 68, n. 2, 2013. Disponível em: https://epubs.icar.org.in/index.php/IJAgS/article/view/27317. Acesso em: 29 oct. 2025.