Effect of Supplemental Irrigation and Nitrogen Rate on Grain Yield, Yield Components and Protein of Wheat Variety Koohdasht
Fallahi , H. A. , Siadata. , Ezat Ahmadi , M
This experiment was carried out at Agric. Exp. Stn. of Gonbad. The experiment design was a Randomized Complete Block arranged in a strip-plot. Vertical factor consisted of four irrigation levels (I0= without irrigation, I1= Irrigation at flowering, I2= Irrigation at grain filling and I3= Irrigation at flowering and at grain filling). Four rates of N fertilizer (0, 30, 60 and 90 kg N (as urea)/ha) were horizontal factor. The results revealed that increasing N fertilizer significantly increased grain yield and protein content and yield, biologic yield, harvest index, while N.U.E. significantly reduced. The highest yield was obtained at 90 N kg/ha, however it had not any significant difference with 60 kg N/ha. Irrigation at both flowering and filling period (I3) significantly increased grain yield, grain per spike, grain yield and protein content and yield, N.U.E. while other traits reduced. Interaction of N fertilizer and irrigation was non-significant for all traits with the exception of protein content and N. U. E.
supplemental irrigation , nitrogen , yield , protein , wheat
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