Objective To explore the effects of the dosage and application time of MH saline-alkali land improvement materials prepared from pulverized coal furnace fly ash on the physical and chemical properties of saline-alkali soil,

Method MH saline-alkali land improvement material prepared with fly ash produced by the pulverized coal furnace process as the base material was subjected to a 25-day soil pot experiment indoors.

Result With different application rates of MH saline-alkali land improvement materials, the pH value, HCO₃^-, and exchangeable sodium ion content of the saline-alkali soil all showed a gradually decreasing change pattern over time. When the application rate was 2.5% and the saline-alkali soil was cultivated indoors for 25 days, the soil pH value decreased by 0.64 units and HCO₃^- decreased by 57.16%. The content of exchangeable sodium ions decreased by 77.27%. Phosphorus and fast-acting potassium content were increased to different degrees, soil bulk weight was reduced to 1.40 g/cm³, porosity was increased by 6.83%, and the proportional distribution of soil solid, liquid and gas was significantly modified. However, organic matter and cation exchange were reduced by 46.06% and 29.96%, respectively, compared with the test soil.

Conclusion MH saline improvement materials can effectively regulate the physical and chemical properties of saline soil and improve the crop growth environment.