The present investigation was carried out during the two growing seasons of 2014/2015 and 2015/2016 at the farm of Nubaria sugar and reefing company. El-Bohera Governorate, Egypt to study the effect of water stress regimes (60%, 80%, and 100 % of irrigation water requirement (IWR) on growth and yield quality of sugar beet plant grown under drip and sprinkler irrigation systems and sandy soil conditions. Results revealed that drip irrigation system with 80% of (IWR) recorded the highest significant leaf area index, sucrose percentage, purity percentage and extractable sugar percentage in both seasons of sugar beet crop. While application of sprinkler irrigation at 100% (IWR) gave the heaviest root weight, root Number /fed, purity percentage and root yield in both growing seasons.Drip irrigation system with 1322 m 3 /fed water (60 % of IWR) give the best satisfy yield and good quality of sugar beet crop under sandy soil and the experimental condition.

In the light of global warming and climate changes, as well as the rapid expansion in sugar beet production in the arid and semi-arid regions, improving sugar beet productivity under deficit irrigation is of great importance. Green waste-derived compost (GWC) is a valuable soil amendment for improving soil organic matter, decreasing waste products and potential pollutants. The application of 14 ton ha-1 of GWC resulted in the highest root and recoverable sugar yields especially under the well-irrigated conditions under drip irrigation. Although, the impurities% in the beet root juice was increased under deficit irrigation conditions, sugar beet root biofortification and juice quality were significantly improved under drip irrigation in response to the application of 14 ton ha-1 of GWC by increasing sucrose content, QZ% and RS%. The application of GWC under drip irrigation enhanced water use efficiency for root yield (WUERY) and recoverable sugar yield (WUERSY), in particular under drip irrigation. The soil chemical and physical properties were significantly improved in response to the application of GWC. The results indicate that the application of GWC is essential for the sustainable sugar beet production and efficient irrigation water use in sandy soils.