Ismael , B. S. (2013). EFFECT OFCHEMICAL FERTILIZERS LEVELS (NPK) ON THE GROWTHAND FLOWERING OF TWO VARIETY OF TULIP ( Tulipa gesneriana) . Diyala Agricultural Sciences Journal , 5(2), 312–318. Retrieved from https://journal.djas.uodiyala.edu.iq/index.php/dasj/article/view/2768