1.
Sekhawat K, Shivay YS, Kumar D. Porductivity and nutrient uptake of spring sunflower (Helianthus annuus) as influenced by nitrogen sources, sulphur and boron levels*. Indian J Agri Sci. 2008;78(1). Accessed October 27, 2025. https://epubs.icar.org.in/index.php/IJAgS/article/view/9776