Integrated interaction between Nano, conventional potassium fertilizer and Zeolite on kinetic K-release from calcareous soil

Calcareous soil suffers from deficiency in available of potassium due to its high contain CaCO3. So, it is important increase the availability potassium. Potassium release rate constant an indicator for ability supply A field experiments sulaimani governorate was conducted evaluate effect amendment with natural zeolite at (0 and 2 t ha-1), three levels Nano fertilizer (0, 5 10 kg conventional K2SO4 100 200 ha-1 K2O) their interactions on kinetic within 55 days. Results revealed that there significant application Zeolite cumulative K-release increased by 13.27 % relative control treatment. Nano, K interaction level K2O + zeolites 33.55 35.35 42.45 mg kg-1 respectively as a compared (24.00 kg-1). Kinetic data were best described parabolic diffusion, power function Elovich models. The constants models indicated all types fertilizers applied gave