Field experiment was conducted in Qazvin, Iran during 2009-2010 growing season aimed at optimizing nitrogen rates under different irrigation regimes for production of turnip rape (Brassica campestris L.-cv. Goldrush). The experiment was conducted using a randomized complete block, factorial design with three replicates. Experimental treatments were irrigation in four levels (I: I1= irrigation on the basis of 80 (control), I2 = 100, I3 = 120 and I4 = 140 mL evaporation from the class A pan) and four nitrogen fertilizer rates (N: N 1= 0, N2 = 50, N3 = 100, N4 = 150 kg ha-1). It was shown that increasing irrigation rate significantly increased 1000 seeds weight, seed yield, seed oil yield, biomass yield and harvest index as control irrigation (80 mL evaporation from the class A pan) had a significant preference in comparison to 140 mL evaporation from the class A pan. Generally application of 100 and 150 kg N ha-1 in control irrigation had a significant preference in comparison to other treatments. The highest seed yield and seed oil yield obtained by application of 150 kg N ha-1 in control irrigation by average of 5586 and 2348 150 kg ha-1, respectively. The interaction effect of irrigationxnitrogen had not a significant increase on harvest index.
M. Begdelo, A.H. Shirani Rad, G. Noormohammadi and A.A. Tajalli, 2011. Nitrogen Rates Effect on Some Agronomic Traits of Turnip Rape under Different Irrigation Regimes. Asian Journal of Agricultural Research, 5: 243-249.