OM SINGH, and P.C. GUPTA. “Effect on Seed Vigour and Soil Moisture Content of Spring Sunflower (Helianthus Annuus) Hybrid and Yield Influenced by Sowing Time and Irrigation”. Indian Journal of Agronomy 47, no. 3 (October 10, 2001): 47_3 . Accessed June 26, 2026. https://pub.isa-india.in/index.php/ija/article/view/3184.