Factors influencing P transformation

SOME IMPORTANT FACTORS INFLUENCING P TRANSFORMATIONS 7.1. Temperature 

The balance between the mineralisation and immobilisation of P in soil is strongly influenced by temperature, which causes the marked seasonal fluctuations observed in labile P levels of temperate and cool-temperate grassland soils and of total P levels of cool-temperate cultivated soils. Under cultivation however, P is apparently more stable than C, N or S in temperate climates but not in tropical climates 

High P mineralisation rates are observed above 30°C, coinciding with optimum temperatures for growth of many bacteriaHowever, some soil phosphatases (e.g. phytases) apparently have optimum temperatures around 45°C so that cell-free phosphatases may make a contribution to the mineralisation process at higher soil temperatures . 

The availability to crops of the P in crop residues is governed largely by temperature. At high temperatures and 

At temperatures below 30°C, immobilisation of the major plant nutrients by soil microorganisms is increasingly favoured, with cold-tolerant species like yeasts playing a more important role.  

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