Determination of Stopping Irrigation Time for Canola Genotypes in North Khouzestan Conditions

Canola genotypes reaction to stopping irrigation was surveyed. This experiment was carried out as a split plot randomized block design whit three replications in the Safiabad Argicultural Research Center for two years. Main plot was considered of different levels of stopping irrigation (Stopping irrigation at the ending flowering، poding، 10% and 30% ripening of pods in main stem) and sub plot was included 4 canola genotypes (SG10-86369، SG19-86369، SG63-86369 and Hyola401). Combined results showed that the effects of year، stopping irrigation، genotypes، and interaction stopping irrigation × genotypes were significant on number of pods per plant، number of grain per pod، 1000 seeds weight، harvest index and grain yield. Means of interaction stopping irrigation × genotypes showed the highest number of pods per plant (97. 62) at stopping irrigation at 30% ripening of pods in main stem belonged to Hyola401 genotype and the lowest amount achieved in SG10-86369 with stopping irrigation at ending of flowering. The highest 1000 seeds weight (4. 18 gr) appointed to Hyola401 genotype with stopping irrigation at 30% ripening of pods in main stem. Genotypes reaction were been different to time of stopping irrigation. The highest grain yield (2743. 5 kg/ha) belonged to Hyola401 genotype with stopping irrigation at 30% ripening of pods in main stem and the lowest amount (1465. 83 kg/ha) appointed to SG63-86369 genotype with stopping irrigation at the ending of flowering. By considering the same reaction of Hyola401 genotype to stopping irrigation at 10% and 30% ripening of pods in main stem، it can be noted that the stage of 10% ripening pods in main stem is optimum stage for stopping irrigation.