Effect of deficit-irrigation management on components and yield of sugar beet

To investigate the effects of different irrigation amount and methods (tape and furrow) on different parameters such as: water use efficiency, yield components and also different quality parameters of sugar beet, an experiment was performed in the water resource engineering field in College of Agriculture, Razi university in Kermanshah, in the west of Iran in 2010 . The experiment was split plot in randomized complete blocks design with 3 levels of irrigation water requirement as main factor (50,75 and 100%) of cumulative evaporation from A-class pan with tape irrigation method and 100% of the same condition but with surface(furrow) irrigation method. The variety of sugar beet was Rasool. Briefly, the results of investigation showed that in both furrow and tape irrigation method (in 100% treatment), the amount of water use efficiency in furrow irrigation method was 1.7 times more than tape method, while the root yield just increased 1.6 (ton /hectare) and water use efficiency in root and sugar yield were decreased 2.89 and 0.56 (Kg/m3) of water use respectively. Also, in a comparison of results of different treatments showed that there is no significant difference, between the average results of potassium and sodium of sugar beet root. But also, significant differences were found based on the other parameters such as: nitrogen, weight, length and sugar of sugar beet roots and leaf relative water content. The results of investigation showed both treatments of (50 and 75 %) were in the same group based on sugar content, but significant difference were found in those treatment based on root and sugar yields. The final results showed that the treatment of tape irrigation with 75% water requirement was much better than other treatments. The amount of chlorophyll in leaf in treatment of 50%was maximum Because of water tension.