在银川市西夏区平吉堡镇研究了滴溉条件下水肥耦合效应对甜高粱新品种中科甜2号生物学特征和产量的影响，结果表明:灌溉量、N和P2O5三者对中科甜2号的生产力形成存在显著的协同作用，最佳水肥配比为:灌溉量3 000 m3/hm2，施肥量N 300 kg/hm2、P2O5 150 kg/hm2。该水肥配比下中科甜2号各生物学指标及折合产量最高，干物质产量可达37 653.4 kg/hm2。Canoco排序分析结果表明，灌溉量、N和P2O5对甜高粱产量形成的累计解释量高达88.5%，灌溉量是影响生产力形成的主导因子，N次之，而P2O5的作用相对较弱，说明合理调控灌溉量和N用量是提高甜高粱生产力的关键。

The effects of water and fertilizer Coupling on biological characteristics and yield of sweet sorghum cultivar Ketian 2 is studied under the condition of drip irrigation at pingjibu town of Xixia district in Yinchuan city. The result shows that the irrigation amount， N fertilizer and P fertilizer on the productivity of sweet sorghum is born three significant synergies. Best is configured to: water irrigation amount is about 3 000 m3/hm2， N is about 300 kg/hm2， P is 150 kg/hm2. The configuration Zhongketian 2， the biological indicator and the highest yield， dry matter of up to 37 653.4 kg/hm2. Canoco sorting analysis showed that the irrigation amount， the N fertilizer and P fertilizer production formation of sweet sorghum， cumulative explain rate is as high as 88.5%， irrigation quantity is the dominant factor affecting the formation of productivity， N fertilizer， and the role of P fertilizer is relatively weak， this shows that reasonable regulation and control irrigation quantity and applying N fertilizer content is the key to improve the sweet sorghum productivity.

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宁夏回族自治区农业综合开发科技推广项目(NTKJ2015-01-02)。