effects of the amount of water in tape drip irrigation on quality and quantity of yield of two canola varieties in behbahan region

this study was performed to investigate the effect of different levels of irrigation water applied in tape drip irrigation on yield, seed yield components, oil yield, seed oil percent, and seed water use efficiency (wue) of two canola varieties in behbahan agriculture research station in 2009 and 2010 seasons. the experiment was performed in split plots as a randomized complete block design with 4 replications. the main factor was the different levels of irrigation water (50%, 75%, 100%, and 125% of water requirement) in tape drip irrigation and the sub factors were two canola varieties including hybrid hyola 401 and rgs003. the results showed that the effect of different irrigation water amounts on seed yield and its components and the seed wue was statistically significant at 1% level. the effect of canola variety on seed yield, seed thousand weight, the number of seed in capsule and seed wue was significant at 1% level and the best variety was hybrid hyola 401. the highest seed yield was found for the treatments 125% water requirement (3161 kg/ha) and 100% water requirement (3053 kg/ha), respectively. however, the treatment of 100% water requirement was the best treatment as it consumed less water. the wue in the best treatment i.e. canola hybrid hyola 401 with 100% water requirement, was 0.81 kg/m3.