Influence of Composite Amendments on the Characteristics of Sandy Soil

Xinrui Sui, Lingyan Wang, Xinyao Lv, Yanan Liu, Yuqi Zhu, Lingyun Fan and Hanxi Wang ()
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Xinrui Sui: Heilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Regionsyin, School of Geographical Sciences, Harbin Normal University, Harbin 150025, China
Lingyan Wang: Heilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Regionsyin, School of Geographical Sciences, Harbin Normal University, Harbin 150025, China
Xinyao Lv: Heilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Regionsyin, School of Geographical Sciences, Harbin Normal University, Harbin 150025, China
Yanan Liu: Heilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Regionsyin, School of Geographical Sciences, Harbin Normal University, Harbin 150025, China
Yuqi Zhu: Heilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Regionsyin, School of Geographical Sciences, Harbin Normal University, Harbin 150025, China
Lingyun Fan: Heilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Regionsyin, School of Geographical Sciences, Harbin Normal University, Harbin 150025, China
Hanxi Wang: Heilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Regionsyin, School of Geographical Sciences, Harbin Normal University, Harbin 150025, China

Sustainability, 2025, vol. 17, issue 17, 1-20

Abstract: Soil desertification control is a global challenge, and the barrenness of sandy soil limits the growth of plants. To enhance the vegetation growth capacity of sandy soils, the preparation of soil amendments and the experiment of improving desertified soil were conducted. The soil amendment is prepared by mixing polyacrylamide (2.7%), biochar (16.2%), sodium bentonite (16.2%), straw fibers (5.4%), corn straw (2.7%), sheep manure organic fertilizer (54.1%), and composite microbial agents (2.7%). The laboratory experiment was conducted to investigate the effects of varying rates (0, 1.5%, 3%, 4.5%, 6%) of composite soil amendments on the properties of sandy soil and the Lolium perenne L. with a growth period of 30–60 days. The results indicated that the application of composite amendments at different rates maintained the soil pH between 7.0 and 7.5, increased the electrical conductivity, and significantly improved the soil moisture content, soil organic carbon (SOC), total nitrogen (TN), and total phosphorus contents. Under the condition of 3% amendment, the soil TN content increased from 0.74 to 1.83 g·kg −1 . The composite amendments remarkably promoted L. perenne growth, as evidenced by increased plant height, dry weight, and nitrogen and phosphorus nutrient content, while the SOC content increased by 1–4 times. The application of composite amendments, prepared by mixing materials such as biochar, organic fertilizer, crop straw, microbial agents, bentonite, and water-retaining agents, enhanced the physicochemical properties of sandy soil and promoted L. perenne growth, and 3% was the most suitable application rate. These findings are expected to advance desertification-controlling technologies and enhance soil carbon sequestration capacity.

Keywords: soil amendments; sandy soils; L. perenne; soil organic carbon (SOC); straw (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2025
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