Effect of levels of humic acid at different times on improvement of the growth of calendula (Calendula officinalis L.) plant
By: al-Nashshar, Yasir Ismail. Alexandria Science Exchange Journal. Vol. 42, no. 3 (Jul. / Sep.2021), pp.665-675, 11 p.
Subjects: Liquid fertilizers; Ornamental plants; Photosynthesis; Sustainable development; Water Stress