AL-Jumally, Abul whab. A., and Mohammed O. AL-Jumally. “EFFECT OF HUMIC ACID FOLIAR APPLICATION AND POTASSIUM FERTILIZER ON GROWTH AND YIELD OF POTATO (Solanum tubersumL.) UNDER DRIP IRRIGATION SYSTEM ”. Diyala Agricultural Sciences Journal , vol. 4, no. 1, June 2012, pp. 205-19, https://journal.djas.uodiyala.edu.iq/index.php/dasj/article/view/5747.