Abstract
This study was consummated during the period 1st Sep 2021 to 1st Jul 2022, in the Field of Horticulture Department/Agriculture Engineering Science College/ Duhok University/ Kurdistan region Iraq, aiming to study the effect of three levels of NPK fertilizer (urea, triphosphate, potassium sulfate) control (0,0,0), low (100,75,50), high (200,150,100) mgl-1 and five media (clay soil, loamy soil, clay soil+ loamy soil, peat moss + clay soil + loamy soil, peat moss + clay soil + loamy soil + compost) by volume, on the growth and Gel production of two species of Aloe (Aloe vera, Aloe butteneri) plant. The results can be summarized as follow. Increased NPK to high (200,150,100) mgl-1 increased significantly leaf size, Gel fresh weight, plant growth index, and leaf area for the two species. Also, the fourth media (peat moss + clay soil + loamy soil) and fifth media (peat moss + clay soil + loamy soil + local compost) were the best media for the most of studied parameters, whereas the third media (clay soil + loamy soil) was the least effect on most of the studied parameter. Aloe vera species a significantly superior to the Aloe butteneri species in all studied parameters.
