Tegegnework Gebremedhin. “Efficacy of Foliar Nutrition on Vegetative and Reproductive Growth of Sunflower”. Global Journal of Science Frontier Research 15, no. D9 (May 15, 2015): 37–41. Accessed May 5, 2024. https://journalofscience.org/index.php/GJSFR/article/view/1689.