| Water release characters of sodium polyacrylate and its effects on soil physical parameters |
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| DOI：10.7606/j.issn.1000-7601.2017.02.27 |
| Key Words: sodium polyacrylate soil water permeability soil compactness soil shrinkage |
| Author Name | Affiliation | | LV Guo-hua | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | JIANG Shu-fang | Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China | | BAI Wen-bo | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | WU Yong-feng | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | SONG Ji-qing | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China |
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| Abstract: |
| Application of sodium polyacrylate (PAANa) in agriculture can prevent soil erosion, increase soil moisture, increase grain yield, and improve crop quality. Through laboratory experiments, the water release characters of PAANa was analyzed, and the saturated hydraulic conductivity, shrinkage ratio and compactness of soil under different application ratio of PAANa (0, 0.3%, 0.5%, 1% and 1.5%) were measured. The results showed there was a great difference in water release between PAANa and mixed application with soil. PAANa could absorb 46.4% water at the suction of 1.5 MPa, but could release 100% water in dry soil. The soil water permeability dramatically decreased with the increase of PAANa ratio, and the saturated hydraulic conductivity decreased nearly to 0 m day-1 when the ratio reached 1%. Soil compactness and soil shrinkage ratio increased after drying, thus there were some potential risks when applying PAANa in agriculture. |
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