Abstract:To improve the water and fertilizer utilization efficiency under water and fertilizer integration of bubbledroot irrigation, we conducted the field fertilizer solution infiltration experiment to explore the bubbledroot irrigation wetting front movement and soil moisture and nitrogen distribution rules at different emitter discharge criteria. The result showed that different emitter discharge has a biggist effect on the wetting front transport distance and the distribution of water and nitrogen in wetted body. The distance of the wetting front with the increase of the discharge is increasing. At the end of irrigation,with the soil water content, NH+4-N and NO-3-N fractions at the same location in the wetted body increase with the increase of the emitter flow rate and the distribution of moisture in the body is more uniform. The distance of the anisotropic wetting front migration and the infiltration time is a power function relationship, and the mathematical modelwith wetting front transport distance as the dependent variable and infiltration time and discharge as the independent variables are get. After the end of irrigation, with the continuous infiltration, wetted body of water and nitrogen carry on the redistribution. within the 1-day redistribution, moisture distribution in the wetted body is more evenl and reaches the field capacity. During the 3-day redistribution, the amount of water and NH+4-N content are decreased while NO-3-N content is increased. The results could lay the foundation for further research on the bubbled-root irrigation technology of efficiently using water and nitrogen.
Key words: bubbledroot irrigation;emitter discharge;wetted body;redistribution;nitrogen migration
刘显, 费良军. 灌水器流量对涌泉根灌土壤水氮运移的影响[J]. 排灌机械工程学报, 2017, 35(10): 903-911.
LIU Xian, FEI Liangjun. Transport characteristics of water and nitrogen underbubbledroot irrigation with emitter discharge. Journal of Drainage and Irrigation Machinery Engin, 2017, 35(10): 903-911.
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