VASUDEVAN, S N; VIRUPAKSHAPPA, K; VENUGOPAL, N; BHASKAR, S. Response of sunflower (Helianthus annuus) to phosphorus, sulphur, micronutrients and humic acid under irrigated condition on red sandy-loam soil. The Indian Journal of Agricultural Sciences, Delhi, India, v. 67, n. 3, 2013. Disponível em: https://epubs.icar.org.in/index.php/IJAgS/article/view/29858. Acesso em: 20 oct. 2025.