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| DOI：10.13522/j.cnki.ggps.2020468 |
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| Amending Saline Clay Soil with Fluvial Sediments to Improve Its Physical Properties and Crop Productivity |
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GUO Tongkai, MAO Weibing*, SUN Yuxia, QU Yingjie, WU Jiali
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College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Taian 271018, China
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| Abstract: |
| 【Objective】Clay soil is less permeable and could become hard for roots to penetrate when soil is drying. These could combine to impede crop growth and reduce crop yield. The aim of this paper is to investigate experimentally the feasibility of using fluvial sediment amendment to improve physical properties of clay soils and the consequence for winter wheat yield.【Method】A three-year experiment was conducted in field, and the sediment used for the amendment was taken from the Yellow river. We amended the clay soil with the sediment at rates ranging from 50 to 350 t/hm2, with no amendment taken as the control (CK). The water release curve of each amended soil was measured in laboratory using the pressure-film method, and in the field we measured the change in soil moisture content, bioavailable soil water and the ultimate winter wheat yield.【Result】Amendment with the sediment altered water release curves of the soil significantly, reducing water content under the same matric potential. Both soil moisture and bioavailable water increased with the amount of sediment added in the amendment; the soil water content decreased linearly as the mass of the sediment increased, except for moisture in the range of 0%~14.85% in which their relationship was nonlinear. It was also found that adding the sediment not only reduced soil moisture but also salinity at significant level. These combined to improve winter wheat yield, especially the amendments at rates 50, 100, 150, 200 and 350 t/hm2, which increased the three-year average yield by 26.47%, 26.51%, 18.33%, 27.27% and 30.90% respectively, compared with the CK.【Conclusion】Considering changes in soil physical properties, soil water content and crop traits measured in the lab and field, the optimal ratio (weight/weight) to amend the clay soil using the Yellow river sediments was 6.75%. |
| Key words: clay soil; Yellow river sediment; soil amendment; water ; winter wheat yield |
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