SHAKTAWAT', R P; BANSAL, K. Nutrient content, uptake and yield of sunflower (Helianthus annuus) as affected by organic manures and nitrogen levels*. The Indian Journal of Agricultural Sciences, Delhi, India, v. 69, n. 3, 2013. Disponível em: https://epubs.icar.org.in/index.php/IJAgS/article/view/26566. Acesso em: 28 oct. 2025.