Abstract
Moistube® irrigation (MTI) is a newly developed irrigation technique which uses semipermeable membranes to deliver water to the root zone precisely and slowly. The major objective of this study was to investigate the effects of different parameters (operating pressure head, placement depth of Moistube®) of MTI on infiltration behaviors and irrigation efficiency in clay loam soil. The results show that HYDRUS-2D model had a high accuracy in simulating water movement under MTI. Operating pressure head had substantial effect on the infiltration behaviors. The discharge of Moistube® and the wetting area in soil increased with the increasing operating pressure heads. Placement depth of Moistube® appreciably affected the time when wetting fronts reached the surface and bottom boundaries but had little effect on the discharge of Moistube® and advancing velocity of wetting fronts. Irrigation intensity was dominated by operating pressure head. High operating pressure head would decrease the capacity of water-saving while low pressure head may reduce crop yield. Burying the Moistube® at half the depth of the crop root zone is recommended for high irrigation efficiency when irrigating in clay loam soil. This study is expected to promote the understanding of MTI and bear some recommendations for improving water use efficiency in crop production.
Published Version
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