Effect of treatments with humic substance, potassium and boron on the flower gualities of two varieties of Gerbera under protected conditions. مجلة للعلوم الزراعية [Internet]. 2021 Jul. 10 [cited 2026 Jun. 18];35(1). Available from: https://journal.damascusuniversity.edu.sy/index.php/agrj/article/view/340