Research on the effect of silicates mineral based soil amendments on reducing soil acidity and promoting the growth of spinach
[Objective]Soil acidification is one of the key factors limiting the green and high-quality development of agriculture.Developing effective soil amendments can enhance the productivity of acidic farmlands and ensure food security.[Methods]In this study,pot experiments were conducted to evaluate the effects of silicate mineral based soil amendments from diverse sourc-es on reducing soil acidity and alleviating aluminum(Al)toxicity,and promoting the growth of spinach.[Results]The results demonstrated that,compared with CK,treatments including silicate mineral+oyster shell(T2),silicate mineral+silica-calci-um-potassium-magnesium fertilizer(T3),silicate mineral+hydroxyapatite(T4)and silicate mineral+biochar(T5)increased soil pH by 0.21 to 1.46 units and reduced exchangeable acidity by 24.3%to 85.2%,exchangeable H+by 11.0%to 65.9%,and exchangeable Al3+by 30.9%to 94.7%.Among these,T2 treatment demonstrated the best results,increasing soil pH by 1.46 units and reducing soil exchangeable Al3+by 94.7%.Besides,T2,T3,T4,and T5 treatments reduced the proportion of exchangeable Al3+in soil exchangeable acidity by 9.0%to 64.8%.These treatments also promoted spinach growth,en-hanced the accumulation of Ca and Mg in plants,and reduced the concentration of Al in plants.In addition,fresh weight and dry weight of spinach increased by 0.60 to 17.90 times and 0.16 to 5.32 times,respectively.The treatments enhanced plant Ca accumulation by 123.0%to 1170.0%and Mg accumulation by 75.0%to 1684.0%,while reducing plant Al concentration by 10.2%to 86.0%.Pearson correlation and PCA analysis showed that soil exchangeable Al3+content(P<0.001),plant Al concentration(P<0.01)and plant Mg concentration(P<0.001)were the core factors affecting spinach biomass.[Conclu-sion]Silicate mineral based soil amendments,particularly those combining silicate minerals with oyster shells,showed great po-tential for preventing soil acidification and promoting crop growth.These findings provided technical support for the utilization of silicate minerals and the improvement of soil acidification.
Silicate mineralSoil acidificationExchangeable Al3+Spinach biomassCalcium and magnesium uptake
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