Increasing nitrogen rate from 75 and 90 kg N/feddan significantly increased dry weight, LAI, CGR, root length, root weight, top yield, root yield, concentration of -amino-N% and Na + K in roots, loss sugar%, sugar yield and WU. The inverse was true in root/top ratio, gross sugar%, white sugar % and juice purity %. Nitrogen rate had slightly effect on WUER and WUES.Application of micronutrients through seed soaking and foliar spraying (SS+FS) produced the greatest dry weight, root/top ratio, LAI, CGR, root length, root diameter, root weight, top yield, root yield, gross sugar%, white sugar % and juice purity %, sugar yield, WUER and WUES. SS was at par SS+FS in most these traits. FS increased concentration of -amino-N% and Na + K in roots and the most of mentioned traits compared with control.All interactions had a significant effect on root and white sugar yields/feddan. The maximum root and white sugar yields and the best WUER and WUES were achieved from plants irrigated at 55% DAM and received 90 kg N/feddan along with SS+FS It can be concluded that the irrigation at 55% DAM along with 90 kg N/feddan and SS+FS or SS was the recommended treatment for optimum root and extractable white sugar yield per unit area with less water consumptive use at Kafrelshiekh Governorate.
INTRODUCTIONThe great challenge for the coming decade will therefore, be the task of increasing food production with less water particularly in areas with limited water. Increasing agricultural productivity by making the most effective use of the available water resources or more crop per drop is a major challenge. Water regime is an option that may increase water use efficiency. Mahmoodi et al (2008) found that the optimum soil water content for root yield of sugar beet is 70% of field capacity with 78.5 t/ha. The minimum root yield (52.5 t/ha) was observed at 90% of field capacity. Irrigation at 30, 50 and 70% of field capacity had same effect on sugar content while sugar content decreased at 90% field capacity. When the available soil water content was at 70% of field capacity, maximum root yield and quality was observed. Fabeiro et al.(2003) reported that Moderate water consumption rates (6898 m 3 ha