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| DOI：10.13522/j.cnki.ggps.20190132 |
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| Distribution of Soil Water and Fertilizer under Double Points Source of Drip Irrigation in Different Fertilization Sequences |
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SHANG Shilong, HAN Qibiao, SUN Hao, HUANG Xiuqiao, DU Siqi
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1.Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences/Key Laboratory of Water Saving Agriculture of Henan Province/Key Laboratory of Water Saving Irrigation Project of Ministry of Agriculture Xinxiang， Xinxiang 453002, China;
2.Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China
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| Abstract: |
| 【Objective】 Research the transport routine and distribution characteristics of water and fertilizer under the intersection of double points source of drip irrigation within different fertilizer’ s sequences, furthermore, to provide theoretical guidance for the design and effective operation of drip irrigation system.?【Method】Through performing indoor soil-bin experiments, the movement of wetted front and the distribution of water and nitrate nitrogen in the wet body were studied under different fertilizer's concentrations and sequences.【Result】The horizontal and vertical movement distance of soil wetted front accorded with power function relation with infiltration time on the un-intersection surface, while it conformed to polynomial functional relation on the intersection surface. The water distribution routine of each treatment was basically the same. On the intersection surface, the water content was not greater than that in other locations of the same soil layer, but the content of nitrate nitrogen was greater than that in other locations of the same soil layer. The interference would affect the migration of wetted front and the nitrate nitrogen content on the confluence surface. When the concentration of fertilizer solution was increased, the concentration of nitrate nitrogen in the wetted body was increased. Under different fertilization-sequence, the distribution of nitrate nitrogen in the wetted body and the edge of the wetted body were different. 【Conclusion】It is dominant to conduct comprehensive consideration of the leaching and distribution routine of nitrate nitrogen. Under the condition of point-source interference, compared with the strategy of fertilizer-water, it is suitable to use the strategy of water-fertilizer-water (1/4W-1/2N-1/4W, 3/8W-1/2N-1/8W). |
| Key words: fertilization-sequence; point source infiltration; wetted front; soil water; nitrate; drip irrigation |
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