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| DOI：10.13522/j.cnki.ggps.20180238 |
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| Movement of Water and Nitrate in Sandy Soil Containing a Layer of Mixture of Water-absorbing Polymer and Soil |
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HAN Yunyun, XU Ying, HE Jiuxing, BAI Wenbo, SONG Jiqing, LV Guohua
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1.School of Hydraulic Energy and Power Engineering, Yangzhou University, Yangzhou 225009, China; 2. Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
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| Abstract: |
| 【Objective】 Water-adsorbing polymers have been used an agent to improve the ability of soil to retain water and the objective of this paper is to study the movement and retention of water and nitrate in soil containing a layer of mixture of water-adsorbing polymer and soil. 【Method】Sodium polyacrylate (SAP) was used in this paper as the agent and based on its adsorptive ability to water and nitrate, the polymer was mixed with soil. A layer of such a mixture was packed at different depths in soil columns, and water and nitrate infiltration in the columns was studied experimentally to elucidate the impact of thickness and location of the mixture layer on water flow and nitrate leaching.【Result】 The mixture became impermeable when the ratio of sodium polyacrylate to loam soil was higher than 1%. Packing a layer of the mixture 0.9~1.5 cm thick in subsoil worked well. The nitrate was mainly found in the top soil and in the mixture, accounting for 87.2% of the total nitrogen, effectively reducing nitrate leaching.【Conclusion】Applying a layer of the mixture of soil and sodium polyacrylate in subsoil can improve water retention and ameliorate nitrate leaching. In our experiment burying a 1cm thick mixture with the sodium polyacrylate to loam soil ratio at 1% gave good results. |
| Key words: water-absorbent polymer; water and nitrogen leaching; sandy soil; soil remediation |
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