What Soil Properties are Influenced by pH?
The influence of pH on soil chemistry is complex, and the impact of pH differences on plant performance varies with plant species. Some of the widely accepted adverse effects of low soil pH are: • Aluminum (Al) and manganese (Mn) toxicity to plant roots. These two elements increase in solubility as pH decreases, especially below pH 5.5. • Decreased availability of phosphorus (P) due to formation of insoluble iron (Fe) and aluminum compounds. Phosphorus is an essential nutrient which frequently must be applied to soil as fertilizer. • Poor performance of nitrogen-fixing bacteria.