The effects of plant density and nitrogen management on yield, NUE and NARF of durum wheat in Karaj

This experiment was conducted to investigate the effects of plant density and nitrogen management on yield and quality of durum wheat promising lines of D-81-6 in temparate climates. The experimental design was RCBD in split factorial arrangement with two factors and three replicates. The factors studied were seed density in main-plots including 400، 500 and 600 seeds/m2 for the temperate climates of Karaj and nitrogen management in sub-plots including 10 levels of nitrogen rates (138 or 184 Kg/ha N) and timings of control (no N application) and one third split soil application of nitrogen fertilizer as basal or top dressed in each growth stages of complete tillering، mid-jointing or anthesis onset. According to the simple and combined ANOVA results in Karaj there was no significant effect of seed density on grain yield and other studied parameters and the recommended density was 400 seeds/m2 but nitrogen had very significant effect on the grain yield and other studied parameters and the recommended N usage was 138 Kg/ha N and the one third basal and split top-dressed application in any stages of complete tillering، mid-jointing or anthesis onset. But concluding remark was to use nitrogen according to the cropping history and the soil N test results.