بررسی اثر رژیم های مختلف آخرین آبیاری بر عملکرد دانه و اجزای عملکرد ارقام کلزا

Abstract: In order to study effect different regimes of final irrigation on yield and components yield of canola cultivars a field experiment was conducted on spilt design based on Randomized Complete Block design with 3 replication in station research zahak during three 2008, 2009 and 2010 years. The time irrigation was given the mainplot at six levelat (I1=irrigation complet in all stages (rosset, buding, flowering, poding and last irrigation 5 day after end flowering), I2=irrigation in rosset, buding, flowerin, and last irrigation in 20 percent remaind flower in plants, I3=irrigation in rosset, buding, flowering, poding and last irrigation in bigning color change in siliqes of origin stem. I4=irrigation in rosset, buding, flowerin, and last irrigation 50 percent poding. T5= irrigation in rosset, buding, flowering, and last irrigation in 10 percent color change in siliqes of origin stem. I6= irrigation in rosset, buding and flowering. Cultivars at three level include (V1= Hyola 401 V2=RGS003 and V3= Sarigol ) in the subplot were given. Results Analysis Variance compound showed that effect year, time irrigation and cultivars on yield and components yield was significant. The highest grain yield,with mean (3240 and 3123 kg/ha respectively) achieved in I1 and I3 treatments and lowest grain yield had, in I6 and I5 treatments with mean (2519 and 2681 kg/ha respectively). Between cultivars, highest grain yield had Hyola 401 hybrid with 3169 kg/ha than cultivars other. Can be concluded that under unavailability of irrigation water fifth, the last irrigation (irrigation four) should be treated in accordance with I2 treatment, in between the end of flowering and before the color change in the main stem. And if not exist restrictions for availability, last irrigation, should be treated in accordance with I3 treatment in canola varieties .