KUMAR, ARVIND; SARKAR, A K; SINGH, R P; SHARMA, V N. Yield and trace metal levels in rice (Oryza sativa) as influenced by flyash, fertilizer and farmyard manure application. The Indian Journal of Agricultural Sciences, Delhi, India, v. 68, n. 9, 2013. Disponível em: https://epubs.icar.org.in/index.php/IJAgS/article/view/27678. Acesso em: 28 oct. 2025.