YANG Bin1, ZHAO Yuefen2, CHEN Yanyu2, WANG Haitao1, MO Yan1, WANG Jiandong1*
1.China Institute of Water Resource and Hydraulic Research, Irrigation and drainage department, Beijing 100048, China; 2.Beijing IWHR Corporation, Beijing 100048, China
Abstract：The main objective of this research is to obtain the design parameters and hydraulic perfor-mance of the trace drip tape in the field.The hydraulic performance of the trace drip tape,characterized with the discharge of 900 mL/h, were evaluated by laboratory and field trials. The results revealed that the manufacturing deviation coefficient of the test tape is 0.04, and the relationship between the pressure and the discharge of the trace drip emitter is in accord with the function used for traditional drip emitter.The discharge rate of the trace emitter under the buried condition is more sensitive to the pressure change compared with that under surface free flow condition, and the decrement of discharge is not obvious when the trace drip tape was buried in field, and the average discharge rate of buried trace emitter under nominal working pressure(10 m)is reduced by 3%-8%. In addition, when the flow rate deviation coefficient of drip irrigation system is less than 20%,and combined with research results concerning spatial variability of soil moisture in the field, the limit laying distance of the trace drip tape is about 150 m used for subsurface drip irrigation.
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