Abstract：To improve the water and fertilizer utilization efficiency of bubbled-root irrigation, in this paper, experiments are carried out on field fertilizer infiltration to identify wetting front migration, wetting volume, soil water and nitrogen distribution in different distances between emitters(30, 40, 50, 60 cm). Results show that the distance between emitters has a great influence on the migration distance of wetting front and wet volume. With increasing distance between emitters, the maximum horizontal wetting distance and wet volume both are large, but the migration distance of wetting front and intersection time all decrease. After the irrigation, the soil moisture and NH+4-N content are the highest under the emitters and higher at the intersection. As redistribution continuing, the wetting front migration and wet volume increase, and NH+4-N content in the volume rises gradually. The redistribution for 1 day, the wetted body basically reaches steady state; for 5 days, the NH+4-N content achieves the maximum. Within 15 days of observation, the NO-3-N content is always in a steadily increasing state. The above results will lay a foundation for a better use efficiency of nitrogen and water in bubbled-root irrigation.
刘显, 费良军, 刘扬. 涌泉根灌交汇入渗对土壤水氮运移特性的影响[J]. 排灌机械工程学报, 2017, 35(3): 263-270.
LIU Xian, FEI Liangjun, LIU Yang. Effects of bubbled-root irrigation interference infiltration on transport characteristics of water and nitrogen. Journal of Drainage and Irrigation Machinery Engin, 2017, 35(3): 263-270.
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