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| DOI：10.13522/j.cnki.ggps.2017.0354 |
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| Impact of Soil Amended with Different Materials on Phosphorus Leaching in Hetao Irrigation District |
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ZHAO Chunxiao,WEI Shuzhen, GAO Fanshen, GAO Wa, WANG Yingnan, ZHENG Haichun
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Inner Mongolia Autonomous Region Soil Fertilizer and Water Saving Agricultural Workstation, Hohht 010010, China
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| Abstract: |
| 【Objective】 Soil amendment is a technique to improve soil productivity, and the objective of this paper is to study the change of phosphorus leaching in soil amended with different materials in Hetao Irrigation District, Inner Mongolia Hetao. 【Method】 The experiment was conducted in a corn field in Hetao Irrigation District with soil amended by activated carbon, bentonite, biological fertilizer, organic fertilizer, granular polyacrylamide and polyacrylic acid potassium, and humic acid fertilizer, respectively. During the experiment, we measured the change in total phosphorus (TP) and soluble phosphorus (SP), and analyzed phosphorus leaching. 【Result】 Compared with conventional treatment, soil amended with bentonite, activated carbon, potassium polyacrylate, and polyacrylamide reduced the total soluble P by 24.76%, 21.32%, 18.36% and 17.31%, respectively; and the concentration of soluble P by 32.47%, 31.15%, 28.45% and 22.82% respectively. Compared with the conventional treatment, soil amended with biological fertilizer, humic acid and slow-released fertilizer did not have a noticeable impact on TP and SP concentration in soil water, while the soil amended with granular organic fertilizer increased phosphorus content in soil water. The phosphorus taken up by plant increased slowly with fertilizer application. Phosphorus was mainly found in the 0~40 cm soil, while below 40 cm the phosphorus content remained also unchanged. The fraction of soluble phosphorus in soil water was large, reaching 47.6% to 82.1% of TP in found soil water at an average of 67.8%. Soluble phosphorus was the main form of phosphorus in soil water. 【Conclusion】The eight amending materials affect total phosphorus and soluble phosphorus differently, and compared with others, bentonite, activated carbon, potassium polyacrylate and polyacrylamide affected P more significantly after being amended with soil. |
| Key words: non-point source pollution; treatment measures; nutrient leaching; characteristic distribution |
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