| Cite this article: | 孙玮皓,申孝军,Abdoul Kader Mounkaila Hamani,等.滴灌施肥时序对不同质地土壤水氮分布的影响[J].灌溉排水学报,0,():-. |
| sunweihao,shenxiaojun,Abdoul Kader Mounkaila Hamani,et al.滴灌施肥时序对不同质地土壤水氮分布的影响[J].灌溉排水学报,0,():-. |
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| Effects of Drip Irrigation and Fertilization Timing on Water and Nitrogen Distribution in Different Texture Soils |
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sunweihao, shenxiaojun, Abdoul Kader Mounkaila Hamani, sizhuanyun, gaoyang
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Farmland irrigation research institute
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| Abstract: |
| 【Objective】The present investigation aimed to reveal the movement and distribution characteristics of soil water and nitrogen (N) in different soil textures under different time sequence of drip irrigation, and to provide a technical support for an efficient and rational operation of drip irrigation system. 【Method】Through an indoor experiment with soil box, three types of soil textures were set up, including sand, loam and clay, and three kinds of fertilization time sequence, including 1/2N-1/2W (applying N fertilizer in the first half of the time), 1/4W-1/2N-1/4W (after irrigation in the first quarter of the time, N fertilizer was applied in the middle half of the time) and 3/8W-1/2N-1/8W (N fertilizer was applied in the middle half of the time after irrigation in the first 3 / 8 time). The movement of soil wetting front and the distribution characteristics of water and nitrate-nitrogen in soil were analyzed. 【Result】The results showed the depth of wetting volume decreased with the increase of clay soil content. Under the condition of the same irrigation amount and emitter flow, there were significant differences in the horizontal and vertical infiltration distances and soil water content distribution characteristics of the three types of soil. Nitrate was accumulated at the edge of the wetting volume, and the trend of nitrate migration to the edge of the wetting volume became more and more evident with the advance of fertilization order. 【Conclusion】For the sandy, loam and clay soils, the fertilization time sequence of 3/8W-1/2N-1/8W, 1/4W-1/2N-1/4W and 1/2N-1/2W is beneficial to reduce the risk of fertilizer leaching. |
| Key words: drip irrigation; soil texture; time sequence of fertilization; wetting front; soil moisture; soil nitrate-nitrogen |
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