Effects of Different Drip Irrigation Systems on Yield and Water Use Efficiency of Pear-jujube in the Loess Plateau

YE Shenglan; LIU Tiancheng

doi:10.13522/j.cnki.ggps.2017.0004

Abstract：[Objective]Explore the suitable drip irrigation system for the water saving and high yield of Lizao in the mountain of northern Shaanxi.[Method]A field experiment was conducted to study the effects of five drip ir-rigation regimes on the growth and water use of jujube.The irrigation quota of T1 treatment was 100 m3/hm2and irrigated 4 times.The irrigation quota of T2 treatment was 135 m3/hm2and irrigated 4 times.The irrigation quota of T3 treatment was 180 m3/hm2and irrigated 4 times.The irrigation quota of T4 treatment was 100 m3/hm2and ir-rigated 3 times.The irrigation quota of T5 treatment was 180 m3/hm2and irrigated 2 times,and with no irrigation as the control(CK).[Result]The results showed that compared with the CK, the bearing branch, fruit set and yield of different drip irrigation system were significantly different (P<0.05). In four years, the jujube hanging length,fruit set and yield of T3 treatment were significantly higher than those of CK.Hanging length and yield of T3 treatment reached 22.0 cm and 16 772.8 m3/hm2in 2012,which were increased by 47.7% and 13.2% respec-tively,compared to CK.At the same time,the water consumption of different irrigation treatment increased along with the increase of irrigation amount.The water consumption of T3 treatment was the highest in different years. The water use efficiency of pear-jujube of low irrigation quota was better than that of the high irrigation quota. Water use efficiency of T5 treatment was the best,which was 1.92 m3/hm2.[Conclusion]Considering the lack of water resources in northern Shaanxi,an economic and efficient irrigation system is recommended in years with high annual precipitation,of which the optimal irrigation quota is 135 m3/hm2,irrigation time is from April 20 to May 17 with twice drip irrigation totally.