اثر پتاسیم و روی بر تحمل به خشکی کلزای پائیزه در شرایط اقلیمی دهلران

In order to study the effect of potassium and zinc sulphate application under drought stress condition an split plot factorial experiment based on randomized completed blocks design with three replications was conducted in Dehloran, Ilam province, during (2011- 2012). Experimental factor consisted of Irrigation levels including: normal irrigation, irrigation holding in flowering stage and irrigation holding two weeks after flowering were arranged in main plots. Potassium and zinc sulphate levels including (0, 90 and 180 kg.ha-1) and (0, 15 and 30 kg.ha-1) respectively were allocated in subplots. The results of analysis of variances showed that the simple effect of experimental treatments had significant effect on all of traits except harvest index. The double and triple interaction between experimental factors had not significant effect on traits except of the flowering branch in main and lateral stems. Results showed that potassium and zinc application had positive and increasing effect on traits and with potassium and zinc increasing yield and yield components had the better effect. Finally, we concluded that potassium and zinc application decrease the effect of drought stress and zinc application decrease the effect of drought stress and using of 180 kg.ha-1 potassium and 30 kg.ha-1 zinc sulphate are advised for the highest yield.