بررسي عملكرد محصول و كارآيي مصرف آب چغندرقند در روش هاي آبياري جويچه اي و باراني

Water Use Efficiency and Yield of Sugar Beet under Sprinkler and Furrow Irrigation

Providing the sugar beet water requirement using new irrigation methods such as sprinkler, drip and subsurface irrigation methods is very important because of high water requirement and long growth period of sugar beet. The aims of this study were to study the effects of irrigation methods on quantity and quality parameters of sugar beet and comparison of water consumption and water ues efficiency. The experiments (C. R. B. D.) were conducted in 2001 at Kamal-abad research station in Karaj with 3 replications. The treatments were: 1) sprinkler irrigation at 30x72 plots, 2) furrow irrigation at 4x82 m plots and 3) furrow irrigation with cut-back at 4x82 in plots. Under sprinkler irrigation method, the sugar beet water requirement was stimated using Penman-Monthith method. Furrow irrigation was irrigated based on traditional farming. In furrow irrigation with cut-back, the entrance discharge was decreased to 0.7-0.8 furrow irrigation after completing advance phase. The results showed that sugar content, root impurities (K, Na, a N), white sugar content, exractability, mollasses sugar, shoot weight, root weight, sugar yield and white sugar yield parameters didnʹt have significant difference (p<0.05) between the irrigation systems. Sprinkler irrigation had better preference over furrow irrigation because of 31% saving in water and 55% increase in water use efficiency on the basis of root weight. Use of cut-back in furrow irrigation caused no significant difference in root weight and its water use efficiency compared to sprinkler irrigation (pK0.05).