新疆是我国重要的糖料基地，在滴灌甜菜产量日益提高的同时，含糖率的下降已成为制约甜菜品质的瓶颈问题。针对该问题，选取目前新疆种植面积较大的高产高糖甜菜品种BETA356为研究对象，通过小区控制试验和氮同位素管栽试验，明确调亏灌溉条件下施氮量和氮素施用时期对滴灌甜菜根冠结构、根冠功能、碳氮代谢产物及其关键催化酶活性的影响，掌握氮素管理模式下高产优质甜菜氮素吸收转运及分配规律，阐明调亏灌溉条件下水氮互作对滴灌甜菜根冠关系和碳氮代谢的控制机理，探讨与甜菜块根品质有关的敏感性理化指标及其氮素调控途径，为精确制定干旱区滴灌甜菜水氮管理制度，进一步提升甜菜品质提供理论和技术支持。

Xinjiang Province has become the country’s most important sugar-producing area. Nevertheless, compared with advanced countries, sugar beet cultivation in Xinjiang is still hampered by the problems of low sucrose content. Appropriate water and nitrogen supply in root zone is essential to guarantee coordinate development of carbon and nitrogen metabolism of sugar beet. This project intends to use “water deficit and nitrogen interaction effect” as its researching main line, to explore the regulation effects of soil moisture and nitrogen supply on yield and root quality of drip irrigated sugar beet by using field experiment and 15N isotope tracing. The variety BETA356 was chose in the experiment, and is a typical beet grown in Xinjiang. The contents of this project are to: analyze the root-shoot relationship of water deficit and nitrogen interaction on yield and sugar content. identify the effects of water and nitrogen coupling on root-shoot growth and carbon- nitrogen metabolism of beets via drip irrigation. subdivide the nitrogen use efficiency of sugar beet on 15N Tracer. This study may provide a theoretical basis for economically rational irrigation and nitrogen application programmer enabling the high yield and quality cultivation of drip irrigated sugar beet in arid area.