SINGH, P.K.; SINGH, D.R.; SINGH, Ved Byas. Effect of nitrogen, phosphorus and bio-fertilizer (Azotobacter) on growth, yield and quality of okra. Indian Journal of Horticulture, [S. l.], v. 67, n. Special Issue, p. 477–478, 2010. Disponível em: https://journal.iahs.org.in/index.php/ijh/article/view/2224. Acesso em: 1 nov. 2025.