MA Hai-yan, LI Fu-lin, ZHANG Ke-feng, HUANG Qian, YU Xiao-lei, JIANG Yao, XIA Hai-bo
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Subsurface infiltrating irrigation is a kind of underground micro-irrigation method. The irrigation water is diverted to the soil at a certain depth under the ground through the buried pipe for subsurface infiltrating irrigation,and then the soil capillary action is used to achieve direct water supply to the root zone of crops. This irrigation method is essentially the same as the irrigation process of “Subsurface Drip Irrigation”. Subsurface infiltrating irrigation can effectively improve soil environmental quality and facilitate crop growth, and it is a highly efficient and water-saving irrigation technology with broad development prospects. It is of great significance to research on subsurface drip irrigation for promoting the development of efficient water-saving agriculture. In this paper, the relevant research progress and existing problems are reviewed from the aspects of soil water transport rule, irrigation technology parameters, irrigation system, influence and regulation of infiltration irrigation pipe clogging etc., and the future research directions are proposed,which may be referred to by scholars in the field of water-saving irrigation research. It is concluded from this review that, compared with the production practice of subsurface infiltrating irrigation, the research on its mechanism is relatively lagging behind, which limits the deep popularization and application of this technology. The main manifestations are as follows: the law of soil water transport under subsurface infiltration irrigation is not clear enough, clogging is still the limiting factor that hinders the application and development of subsurface infiltration irrigation technology, the optimization design of subsurface infiltration irrigation water distribution system needs further research. This paper suggests carrying out a numerical simulation analysis of water infiltration under different irrigation conditions in the future, selecting the appropriate treatment level, studying the main factors affecting the effect of infiltration irrigation, and seeking the optimal combination of irrigation technology parameters. Research on crop irrigation system under the condition of subsurface infiltration irrigation is carried out to form a set of reasonable and perfect irrigation system and test method. Further research should be carried out on the rule of subsurface infiltration irrigation pipe outflow, clogging mechanism and the effective control threshold of key parameters of irrigation water quality when entering the subsurface infiltration irrigation system.