SHAKTAWAT' RP, BANSAL K. Nutrient content, uptake and yield of sunflower (Helianthus annuus) as affected by organic manures and nitrogen levels*. Indian J Agri Sci. 2013;69(3). Accessed October 28, 2025. https://epubs.icar.org.in/index.php/IJAgS/article/view/26566