Application Abstract: Since 2016, there years of experiments have been conducted to evaluated the effects of technical parameters of drip irrigation on the risk of pathogen pollution, emitter clogging, and the effectiveness of nutrients under reclaimed water irrigation. The main results are as follows: (1) the distribution and attenuation of Escherichia coli (E.coli) in crops and soil under different irrigation methods such as sprinkler irrigation and drip irrigation were revealed. Adding chlorine to irrigation water was recommended to reduce the risk of pathogen pollution under the condition of reclaimed water irrigation. (2) The effects of water quality, emitter types, and chlorination methods on emitter clogging were evaluated while different scheme of chlorine application methods were put forward corresponding to different water quality of reclaimed water. (3) The effects of chlorine treatment on soil enzyme activity, crop nitrogen absorption and yield were studied. It is proposed that the chlorination did not cause a substantial chlorine accumulation in the root zone. The enzyme activities for sewage application with chlorination was slightly lower than those for the reclaimed water application without chlorination. (4) A model simulating the hydraulic performance and residual chlorine transport, attenuation and distribution in a drip irrigation system was constructed using the EPANET software package. A design method of the drip irrigation system based on the uniform distribution of residual chlorine was put forward. (5) The temporal and spatial dynamic changes of soil nitrogen and phosphorus contents were studied under reclaimed water and groundwater irrigation. An technology mode was put forward for efficient use of reclaimed water.
