Which factor does NOT contribute to phosphorus availability in soils?

Phosphorus availability in soils is influenced by a variety of factors that affect how phosphorus interacts with soil components and organisms. The correct answer, which identifies a factor that does not contribute to phosphorus availability, is soil temperature.

While soil temperature can impact microbial activity and overall biological processes in the soil, it does not directly influence the chemical forms of phosphorus or the soil conditions that affect phosphorus solubility and mobility. In contrast, the form of phosphorus in fertilizers is crucial because different forms vary in their availability to plants. Soil pH is a key factor since it influences the solubility of phosphorus; certain pH levels can either enhance or inhibit phosphorus uptake due to the precipitation of phosphorus with various minerals. The method of phosphorus application also plays a role, as it can affect how well phosphorus is incorporated into the soil and its accessibility to plant roots.

In summary, while soil temperature can have broad effects on soil health and biological activity, it is not a direct factor influencing phosphorus availability, making it the correct answer to this question.