SINGH, Vinay. Influence of treated sludge, FYM and fertilizers on yield and uptake of micronutrients in spinach. Annals of Agricultural Research, India, v. 34, n. 2, 2014. Disponível em: https://epubs.icar.org.in/index.php/AAR/article/view/37922. Acesso em: 7 jun. 2026.