What practice enhances phosphorus availability in high pH soils?

Using acidifying fertilizers is an effective practice for enhancing phosphorus availability in high pH soils. High pH levels can lead to the formation of insoluble phosphorus compounds, making phosphorus less available for plant uptake. Acidifying fertilizers lower the soil pH, which can help dissolve these insoluble forms of phosphorus, thereby making it more accessible to plants. This process can improve the nutrient's solubility and promote beneficial microbial activity in the soil, which further aids in phosphorus availability.

In contrast, while applying lime is generally done to raise soil pH, it does not contribute to phosphorus availability in high pH settings. Reducing soil compaction can improve root growth and overall plant health, but it doesn't specifically address phosphorus solubility. Limiting water usage can adversely affect nutrient uptake by stressing plants, but it does not enhance phosphorus availability. Therefore, the use of acidifying fertilizers directly targets the issue of phosphorus availability in high pH soils, making it the most suitable practice among the options provided.