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| DOI：10.13522/j.cnki.ggps.2023004 |
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| Effect of Synergistic Regulation with Brackish Water and Improvement Material on Water and Salt Transport in Alkaline Soil |
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FAN Liqin, SHEN Jingli, WANG Xu
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Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750002, China
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| Abstract: |
| 【Background】The shortage of fresh water resources and soil salinization are two major factors restricting agricultural sustainable utilization of saline-alkali land in Yinbei Irrigation District of Ningxia. 【Objective】The Coordinated Regulation on brackish water irrigation and improved materials is an effective way to improve alkaline soil under the background of water shortage. 【Method】Through the one-dimensional vertical soil column infiltration test, the effect of combined different brackish water and different improvement material on water and salt transport in alkaline soil was studied. 【Result】①the water infiltration rate and the cumulative infiltration water amount is the largest in the “phosphogypsum” treatment. The differences between treatments became smaller with the salinity increase of leaching water ②under the leaching water with 1.2 g/L salinity, compared with the control, the total salt content in 0-40 cm soil layer of “phosphogypsum” and “ferrous sulfate + citric acid” treatment was significantly decreased by 31.70% and 30.69%, respectively, but under the leaching water with 3.6 g/L salinity, the two treatment would increase salinity of the upper soil. ③The content of Na+ , Cl-, HCO3-+CO32- in 0-30 cm soil layer of “phosphogypsum” treatment was significantly decreased under the leaching water with 1.2 g/L and 2.4 g/L salinity, but with the salinity increase of leaching water, the leaching effect of Na+ and Cl- decreased, and SO42- content increased. Under the leaching water with 3.6 g/L salinity, the “ferrous sulfate + citric acid” treatment had a better effect on decresing the content of HCO3-+CO32- amd Na+ in 0-30 cm soil layer , and the content of HCO3-+CO32- in 10-20 cm soil layer. ④the “ferrous sulfate + citric acid” treatment had the same effect on decreasing soil pH value of 0-10 cm soil layer with the “phosphogypsum” treatment, but the latter had a more obvious effect on decreasing soil pH value of 0-30 cm soil layer, especially 10-20 cm soil layer. 【Conclusion】For alkalized soil in Yinbei Irrigation District, under light-saline water leaching, it is advisable to use phosphogypsum as soil amendment, but under high-saline water leaching, there is a better effect if phosphogypsum combined with “ferrous sulfate + citric acid” are applied. |
| Key words: brackish water; improved materials; alkalized soil; toal salt content; soil salt ions; soil pH value |
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