SINGH, D P; SINGH, P K. Influence of rate and time of Azolla caroliniana inoculation on its growth and nitrogen fixation and yield of rice (Oryza sativa). The Indian Journal of Agricultural Sciences, Delhi, India, v. 65, n. 1, 2012. Disponível em: https://epubs.icar.org.in/index.php/IJAgS/article/view/17948. Acesso em: 20 oct. 2025.