Effect of planting date in productivity of Nigella sativa L. and quality of essential oil extracted from them in the south of Hama area. مجلة للعلوم الزراعية [Internet]. 2024 Apr. 23 [cited 2026 Jun. 18];40(1). Available from: https://journal.damascusuniversity.edu.sy/index.php/agrj/article/view/1711