Effect of treatments with humic substance, potassium and boron on the flower gualities of two varieties of Gerbera under protected conditions. Damascus University Journal of agriculture sciences, [S. l.], v. 35, n. 1, 2021. Disponível em: https://journal.damascusuniversity.edu.sy/index.php/agrj/article/view/340. Acesso em: 18 jun. 2026.