بررسي تاثير قطع آبياري در مراحل مختلف رشد بر روي كميت و كيفيت چغندرقند در منطقه خوي

Study of the irrigation scheduling effects in different growth stages on quantity and quality of sugar beet in Khoy region, Iran

Water stress decrease water content and water potential between soil and root. Therefore, water potential of plant declines and plant faces with water stress. Water stress in different stages of growth can be useful in different aspects. Water stress can be practiced from two point of view, increasing water use efficiency (WUE) and improving cultural practices. No irrigation in insensitive stages of growth for water stress helps us to save water which could be used for other crops. In this research, the effect of irrigation scheduling at different stages of growth on quality and quantity of sugar beet was studied, in Khoy Agricultural Research station in two years (1999 and 2001). The experimental design was a randomized complete block design with three replications and seven irrigation treatments; as compared to the control treatment (II, full irrigation). WUE was 1.7 and 1.25 kg/ma in I2 and I, treatments, respectively. Omitling irrigation in the initial and in the last stage of growth decreased the irrigation water amount 21.2%, increased available sugar 11% and improved WUE from 1.25 (control treatment) to 1.76. Irrigation treatments had significant effect on sugar content and Na (impurities) and no significant effect on other qualitative characers. No irrigation in initial and last stages of growth caused the most highest increase in sugar content of compared to the control treatment. Aceordingly, sugar content increased from 12.74% to 16.09%.