AL-Juboori , Amer Abdullah, and Abdullah Mohammad Salem. “EFFECT OF SPRAY HUMIC ACID ON THE YIELD AND QUALITY OF TWO CULTIVARS POTATOES . ”. Diyala Agricultural Sciences Journal , vol. 3, no. 2, Dec. 2011, pp. 712-21, https://journal.djas.uodiyala.edu.iq/index.php/dasj/article/view/3076.