Kadhim AQ, Kadhim AA. The effect of natural extracts and tea compost in some root growth parameters of Calendula plant under stress by heavy elements. JKAS [Internet]. 2024 Sep. 17 [cited 2024 Dec. 14];11(3):9-23. Available from: https://mail.journals.uokerbala.edu.iq/index.php/Agriculture/article/view/2331