Abstract

Drought and opportune water use is too important for water saving and high yield product. In order to investigate drought stress on agronomic traits of winter canola, experiment was carried out in 2005 to 2006 crop season. Using two treatments and three replicates, in which irrigation remained as the main factor in seven levels and the two secondary factors consisting of Zarfam and Opera varieties. The results showed that the effect of variety on the seed yield, seed-oil yield, seed-oil percent (1%) and 1000-seed weight (5%) was significant (P<0.05). Interaction between irrigation and cultivars were determined in comparison with the highest grain yield in the normal water conditions of Zarfam variety, the average is 4800 kg/ha. Among the studied parameters, the correlation between the seed-oil yield and seed-oil percent was found positive and significant (P<0.01) as compared to the number of seeds in forming pods and the maximum correlation was found between seed yield and oil yield to be (r = 0.99).

Key words: Drought stress, rapeseed, varieties, yield and yield component.