What is the optimal soil pH range for phosphorous availability?

Phosphorus availability in soils is significantly influenced by soil pH. The optimal range for phosphorus availability typically falls between pH 6 to 7. Within this range, phosphorus is more soluble, allowing for better uptake by plants. At lower pH levels, specifically below pH 6, phosphorus can become more reactive with soil components like iron and aluminum, forming insoluble compounds that limit its availability to plants. Conversely, at higher pH levels, typically above pH 7, phosphorus can react with calcium to form calcium phosphates that may also limit its availability. Therefore, maintaining soil pH within the 6 to 7 range ensures that phosphorus remains readily available for plant absorption, supporting healthy growth and development.