Effect of different ameliorants on coastal saline-alkali soil in eastern Zhejiang under elution conditions
With the coastal saline-alkali soil as the research object, we carried out a soil column leaching experiment by using desulfurized gypsum, calcium superphosphate, biochar, coal cinder and polymaleic anhydride, all with concentration gradients of 1%, 1.5% and 2%, without adding soil ameliorants as co...
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2020-06-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/j.issn.1008-9209.2019.07.220 |
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| Summary: | With the coastal saline-alkali soil as the research object, we carried out a soil column leaching experiment by using desulfurized gypsum, calcium superphosphate, biochar, coal cinder and polymaleic anhydride, all with concentration gradients of 1%, 1.5% and 2%, without adding soil ameliorants as controls. The effects of different ameliorants on salinization characteristics and soil quality of coastal saline-alkali soil in eastern Zhejiang were studied, and the suitable ameliorants for the improvement of coastal saline-alkali soil were selected. The results showed that: 1) In the 0-10 cm soil layer after eluting, 1% coal cinder and 2% polymaleic anhydride had the most significant improvement effect for decreasing soil pH. The improvements of soil electric conductivity (EC) and salinity were the most significant in the 1.5% and 2% biochar treatments. The EC decreased by 93.75% and 84.72% compared with the CK, and the salinity decreased by 55.44% and 44.04% compared with the CK. 2) Soil sodium adsorption ratio (SAR) decreased when the ameliorants were added, among which the 2% coal cinder, 2% polymaleic anhydride, 1.5% calcium superphosphate had the most significant improvement effect. 3) Soil chemical properties and fertility could be improved by the 2% calcium superphosphate, 2% biochar, 2% polymaleic anhydride. 4) Different ameliorants had different leaching efficiencies for salt-based cations: 1% and 1.5% calcium superphosphate could significantly reduce potassium, calcium and magnesium ion contents in the soil, respectively; 1% coal cinder had the best effect on sodium and potassium ion contents in the leaching soil; 1.5% and 2% biochars significantly reduced sodium and magnesium ion contents in the soil, respectively; and 1% and 2% polymaleic anhydride significantly reduced sodium and calcium, magnesium ion contents in the soil, respectively. In conclusion, 1.5% polymaleic anhydride, 1.5% or 2% biochar have the best effect of desalting and fertilizing on the coastal saline-alkali soil in eastern Zhejiang. |
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| ISSN: | 1008-9209 2097-5155 |