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| Effects of soil texture and water pressure on moistube infiltration in vertical inserting mode |
| YU Xiaodi, LIU Xiaogang, ZHU Yifei, QI Yuntao, YANG Qiliang, TANG Jiankai |
| Faculty of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China |
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Abstract Vertically inserted moistube is one of new water-saving irrigation technology and suitable for fruit and economic trees planted in equal row space. In order to investigate the interactive effect of soil type and water head on the infiltration characteristics of vertically inserted moistube, three soil textures(sand, sandy loam and red loam)and three water heads(1.0, 1.5 and 2.0 m)were used, and infiltration rate, cumulative infiltration, wetted soil volume and the characteristics of soil water content distribution were measured. It is shown that the infiltration rate at different times is accorded with the modified Horton model. The cumulative infiltration volume is as a parabolic function of irrigation time. The wetted soil volume expands with increasing water head, and is small on top but big on bottom, approximately pear-shaped. The growth rate of wetted soil body is relatively slow when the water head is low, the growth rate reaches the maximum in the first 4-6 hours after infiltration, and the growth process yields logarithmic normal distribution. The soil type has a significant influence on the soil water content, but the effect of water head is weak. The soil water distribution uniformity of red loam and sandy loam(>80%)is higher than that of sand(<70%). The results can provide a theoretical basis and practical reference for rational applications of moistube irrigation.
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Received: 09 May 2016
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