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| DOI：10.13522/j.cnki.ggps.2017.0159 |
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| Distribution Characteristics of Water-fertilizer and Available Nitrogen under the Integration of Drip Irrigation and Fertilization |
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LI Huixian, WANG Wene, HU Xiaotao, ZHANG Shuo, DU Bin, LI Si, MENG Hao
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Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A & F University, Yangling 712100, China
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| Abstract: |
| 【Objective】 Improve the utilization of water and fertilizer under the integration of drip irrigation and fertilization. 【Method】 The rules of soil moisture, EC migration during the drip irrigation and redistribution and characteristic dynamic distribution of available nitrogen were researched by the different flow of water-fertilizer infiltration experiments. 【Result】 ①At the end of drip irrigation, the soil moisture decreased with the increase of the distance from the dripper. The migration distances of soil moisture and EC with flow of 2 L/h were more farther than the flow 3, 4 L/h in the vertical. After redistribution, the distribution of soil moisture was not significantly influenced by emitter discharge; the main distribution region of soil EC with flow rate 2 L/h was different from flow rate 3, 4 L/h; The main distribution region of soil EC with the flow 4 L/h was similar to that of flow 3 L/h. ②Under the different dripper discharge, the ammonium nitrogen decreased gradually with time, but nitrate nitrogen had an opposite changing trend to that of ammonium nitrogen; The ammonium nitrogen decreased along with the increase of distance from dripper in the radial and vertical directions. The nitrate nitrogen increased gradually as the distance of emitter increased in 24 h, but it decreased after 72 h. 【Conclusion】 The main distribution region of soil EC under different flow rates was inconsistent and the available nitrogen in soil was changed dynamically with time after drip irrigation. So, according to the characteristics of crop growth, the appropriate drip discharge could be selected and reasonable fertilization time was established. |
| Key words: drip irrigation under mulch; soil water content; EC ; ammonium nitrogen; nitrate nitrogen |
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