Abstract
Field experiment was conducted in Girdarasha fields, College of Agriculture .Salahaddin University during the growing season 2006 to study the effect of different levels of nitrogen (0,92,184 Kg N.ha-1) , phosphorus (0,92,184Kg P2O5.ha1) ,potassium (0,120Kg K2O.ha1) , magnesium (0,40 Kg MgO.ha-1) and their combinations on yield component of wheat under rainfed and supplemental irrigation by using factorial Randomized Complete Block Design with three replications. Nitrogen application had a significant effect at (p≥0.05) on weight of total dry matter, grain and straw under rainfed and supplemental irrigation. Highest values (5.09,2.20,2.89) and (8.89 ,4.28,4.61) Mg.ha-1 were recorded from (N1and N2) treatments under rainfed and supplemental irrigation respectively, application of P1 gave highest weight of total dry matter, grain and straw(4.76,2.07,2.69 and 9.37,4.25,5.12) Mg.ha-1 under rainfed and supplemental irrigation. Application of potassium fertilizer caused an increase in weight of total dry matter,grain and straw. .In general combination between fertilizers affected significantly (P≥0.05)on weight of total dry matter, grain and straw under both rainfed and supplemental irrigation. Highest values( 5.79 , 2.86, 3.40) and (10.8, 4.88, 5.97) Mg.ha-1 were recorded from combination treatments (N2P1K0Mg0 ,N2P1K1Mg0, N1P0K1Mg1) and (N1P1K0Mg0, N1P2K1Mg0, N1P1K0Mg0) under rainfed and supplemental irrigation respectively, while lowest values (2.20 ,0.60 ,1.48) and (4.13 ,1.53 ,2.33) were recorded in (N0P0K0Mg0 ,N0P0K0Mg0, N0P0K0Mg1) and (N0P0K0Mg1 ,N0P0K0Mg1, N2P0K0Mg0) under rainfed and supplemental irrigation respectively.
