The Effect of Various Levels of Nitrogen, Phosphorus and Potassium on Production Of Local Red Onion (Allium Cepa L .)

Abstract

Fertilization is one of the efforts done by farmers to increase the production and quality of onions. The research aimed to find out the effect of different levels of nitrogen, phosphorus, and potassium fertilizers on the growth and production of onions. The research was conducted in the Grdarash field, the experimental farm of the College of Agriculture, University of Salahaddin. The research used a spilt–spilled design. The first factor was nitrogen (0, 40, 80, 160 Kg .ha1 ). The second factor was phosphorus (0, 80, 160 Kg.ha-1 ), and the third was Potassium (0, 50, 100 Kg .ha-1 ). The results indicated a highly significant interaction between NPK and onion bulb yield. The treatment (K1 P2 N1) has the highest significant yield production (18 .36 Mg. ha-1 ) And the best interaction between the nitrogen, phosphorus and potassium fertilizers; this treatment addition was (K 50, P 160 and N 40 Mg .ha-1 ). K1 P1 was the most significant interaction between Potassium and Phosphorus. K1 N1 was the most significant interaction between Potassium and Nitrogen. Keywords: Nitrogen, Phosphorus, Potassium, Onion, Bulb yield