A sulfate-palygorskite composite amendment for saline-alkali soil: Simultaneous alkalinity reduction, nutrient enrichment, and crop growth promotion

IF 6.8 1区农林科学 Q1 SOIL SCIENCE

Soil & Tillage Research Pub Date : 2025-09-12 DOI:10.1016/j.still.2025.106872

Yijue Fei , Keren Jiao , Xiaoyang Liu , Baolong Wang , Rui Song , Zilin Meng , Binbin Liu , Jiaqi Wu , Chenyu Qi , Wenfeng Zhou , Yuanlin Zhu , Haixiang Gao , Shuwen Hu

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引用次数: 0

Abstract

This study introduces a composite amendment, containing CaSO₄, MgSO₄, Fe₂(SO₄)₃, and Palygorskite (PGS), for concurrently improving saline-alkali soil physicochemical properties and promoting crop growth via in situ soil regulation and nutrient release. Experimental results demonstrated Layered Double Hydroxide (LDH) structure formation within the amended soil after 20 days, a key in situ mineralization mechanism absent in the control. This process significantly reduced soil pH from 9.85 to 7.86 (a 20.2 % decrease) and drastically lowered CO₃²⁻ content from 33.43 g/kg to 5.12 g/kg (an 84.68 % reduction), effectively mitigating soil alkalinity. Concurrently, exchangeable Na⁺ content decreased markedly from 700.7 mg/kg to 183.67 mg/kg (a 73.8 % reduction), alleviating sodicity. Furthermore, the amendment substantially increased water-soluble nutrient ions: Ca²⁺ (1.17–30.35 mg/kg), Mg²⁺ (0.125–9.58 mg/kg), total available Fe (49.78–89.35 mg/kg), and available SO₄²⁻ (2.06–21.62 g/kg). Notably, the amendment enhanced Soil Organic Matter (SOM) retention after simulated leaching; SOM in amended soil (6.81 g/kg) remained significantly higher than the control (5.14 g/kg), indicating improved carbon stabilization. Pot experiments using ryegrass confirmed the amendment's efficacy, showing significantly enhanced germination, root length, and shoot length, even enabling immediate planting post-application. In summary, the composite amendment leverages in situ LDH formation for stable CO₃²⁻ immobilization and alkalinity reduction, while enriching the soil with essential nutrients (Ca, Mg, Fe, S). This dual action facilitates immediate crop establishment, integrating soil regulation with controlled fertilizer distribution.

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盐碱地硫酸盐-坡筋石复合改良剂：同时降低碱度，丰富养分，促进作物生长

介绍了一种由硫酸钙、硫酸镁、硫酸铁（硫酸铁）₃和Palygorskite （PGS）组成的复合改良剂，通过原位调节土壤和养分释放，同时改善盐碱地的理化性质，促进作物生长。实验结果表明，改良土壤在20 d后形成层状双氢氧化物（LDH）结构，这是对照土壤中不存在的关键原位矿化机制。这一过程将土壤的pH值从9.85降低到7.86（降低20.2% %），并将CO₃²⁻含量从33.43 g/kg大幅降低到5.12 g/kg（降低84.68 %），有效地降低了土壤的碱度。同时，交换性Na⁺的含量从700.7 mg/kg显著降低到183.67 mg/kg（降低73.8 %），减轻了酸碱。此外，修改后的水溶营养离子大幅增加：Ca 2⁺（1.17-30.35 mg/kg）、mg 2⁺（0.125-9.58 mg/kg）、总有效铁（49.78-89.35 mg/kg）和有效硫酸钾²（2.06-21.62 g/kg）。值得注意的是，该改进剂增强了模拟淋滤后土壤有机质（SOM）的保留；改良土壤的SOM（6.81 g/kg）仍显著高于对照（5.14 g/kg），表明土壤的碳稳定性有所提高。黑麦草盆栽试验证实了该改良剂的有效性，显示出显著提高发芽、根长和芽长，甚至可以在施用后立即种植。总的来说，复合改剂利用原位LDH形成稳定的CO₃²和还原碱度，同时丰富土壤必需的营养物质（Ca, Mg, Fe， S）。这种双重作用有助于立即建立作物，将土壤调节与控制肥料分配相结合。

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来源期刊

Soil & Tillage Research 农林科学-土壤科学

CiteScore

13.00

自引率

6.20%

发文量

266

审稿时长

5 months

期刊介绍： Soil & Tillage Research examines the physical, chemical and biological changes in the soil caused by tillage and field traffic. Manuscripts will be considered on aspects of soil science, physics, technology, mechanization and applied engineering for a sustainable balance among productivity, environmental quality and profitability. The following are examples of suitable topics within the scope of the journal of Soil and Tillage Research: The agricultural and biosystems engineering associated with tillage (including no-tillage, reduced-tillage and direct drilling), irrigation and drainage, crops and crop rotations, fertilization, rehabilitation of mine spoils and processes used to modify soils. Soil change effects on establishment and yield of crops, growth of plants and roots, structure and erosion of soil, cycling of carbon and nutrients, greenhouse gas emissions, leaching, runoff and other processes that affect environmental quality. Characterization or modeling of tillage and field traffic responses, soil, climate, or topographic effects, soil deformation processes, tillage tools, traction devices, energy requirements, economics, surface and subsurface water quality effects, tillage effects on weed, pest and disease control, and their interactions.