Synergistic effect of the amendment on soybean yield increase and soil remediation in soda saline-alkali land: focusing on the soil quality index.

The application of organic fertilizer enhanced soybean yield and exerted a highly significant positive influence on soil ions and the SQI, while concurrently inducing a highly significant negative effect on pH, EC, and soil alkalization parameters ( Figure 9C ).

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This study found that compared with the control (CK), the HCO 3 - content and sodium adsorption ratio (SAR) in the 0–10 cm and 10–20 cm soil layers were significantly reduced under organic fertilizer (T3) treatment, while they showed an increasing trend in the 20–30 cm soil layer.

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