تاثير زمان قطع آبياري آخر دوره رشد بر سيلوپذيري چغندر قند

Effect of irrigation cut- off time at the end of growth period on storagability of sugar beet

In most of the sugar beet cultivated areas including Kermanshah, Iran, late season irrigation is cutoff earlier than usual which causes drought stress in the crop. Since root yield still increses in Sept. and Oct. these areas, withholding irrigation in this period reduce root yield and quality of sugar beet. For this reason, an experimente was conducted during 2004- 2005 based on split plot design with four replications in Kermanshah. Withholding times (1, 10, 20 Sept.1 and 10 Oct) were assigned to the main plot and three on- form silage period (10, 20 and 30 days) to the subplots.Withholding irrigation on 10th Sept had the lowest root yield(42.41 tha-1) and that of 10th Oct. had the highest root yield (50.96 tha-1) indicating that the later the irrigation cut- off, the higher the root yield is. Silage for 30 days decreased root yield about 28.5 percentage. Sugar content was not greatly affected by irrigation cut- off and silage treatments but sugar yield is an important character in sugar beet production. Because sugar yield was not significantly affected by irrigation treatments, in some water limited aren and irrigation cut- off in 10th or 20th Sept is recommended.