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用的影响。5 种滴灌制度设置为 T1 处理灌水定额为 100 m3/hm2，灌水 4 次；T2 处理灌水定额为 135 m3/hm2，灌水 4次；T3 处理灌水定额为 180 m3/hm2，灌水 4 次；T4 处理灌水定额为 135 m3/hm2，灌水 3 次；T5 处理灌水定额为 135 m3/hm2，灌水 2 次； 以无灌溉为对照（CK）。结果表明，不同滴灌制度下，梨枣的枣吊长度、座果率及产量均与 CK 差异显著（P<0.05）。4 年中，T3 处理的枣吊长度、座果率及产量均显著高于 CK，且在 2012 年枣吊长度和产量达到 22.0 cm 和 16 772.8 kg/hm2，分别较 CK 提高了 47.7%和 13.2%。同时，各灌溉处理的耗水量随灌水量的增大而增大。不同年份均以 T3 处理的耗水量最高，与其余处理差异显著（P<0.05）。而梨枣水分利用效率表现为低灌水定额处理优于高灌水定额处理，以 T5 处理的水分利用效率最优，为 1.92 kg/m3。结合陕北水资源缺乏的状况，在丰水年适合采用经济高效型的灌溉制度，即灌水定额为 135 m3/hm2，灌水时间为 4 月 20 日和 5 月 17 日，共灌水 2 次的滴灌制度。
Effect of use. Five kinds of drip irrigation system was set as T1 treatment irrigation quota of 100 m3 / hm2, irrigation 4 times; T2 treatment irrigation quota of 135 m3 / hm2, irrigation 4 times; T3 treatment irrigation quota of 180 m3 / hm2, irrigation 4 times; T4 treatment Irrigation rate of 135 m3 / hm2, irrigation 3 times; T5 treatment irrigation quota of 135 m3 / hm2, irrigation 2 times; no irrigation control (CK). The results showed that the jujube jujube length, fruit set rate and yield differed significantly from CK under different drip irrigation systems (P <0.05). In 4 years, the length, fruit set rate and yield of Zizyphus jujuba were significantly higher than those of CK, and the length and yield of Ziziphus jujuba reached 22.0 cm and 16 772.8 kg / hm2 in 2012, up 47.7% and 13.2 %. At the same time, the water consumption of irrigation treatment increases with the increase of irrigation amount. The highest water consumption of T3 was obtained in different years, which was significantly different from other treatments (P <0.05). However, the water use efficiency of Lizao jujube was lower than that of high irrigating ration, and the best water use efficiency of T5 was 1.92 kg / m3. Combining with the lack of water resources in Northern Shaanxi Province, it is suitable to adopt the economical and efficient irrigation system in the wet years, namely drip irrigation with irrigation quota of 135 m3 / hm2 and irrigation time of April 20 and May 17 with a total irrigation of 2 times system.