I know P fixation in soils depend on many factors. For know there are general data sets for the % P fixation in relation to pH. I was wondering if there is something like this bu in retation to soil type.
During the processes of soil formation, phosphorus enters the soil solution and is subsequently converted into fixed phosphorus or absorbed by plants and eventually deposited on the soil surface as plant or animal residues. The phosphorus pool is comprised of primary and secondary phosphate minerals present in soil. Soil phosphorus (P) availability limits crop yields in many regions of the World, while anthropogenic application of P in excess triggers aquatic eutrophication in other regions. While P in unmanaged soils can be predicted to some degree from local soil properties and climate, this approach cannot be used for agricultural systems because humans have altered the P cycle in these ecosystems. The optimum soil pH range for phosphorus availability is 6.0 to 7.0. phosphorus cycles between many different forms in soil, some available to plants and others are not. Phosphorus Fixation: phosphate fixates to iron, aluminum and calcium minerals and attached to clay minerals. pH levels affect fixation and availability of phosphorus.
The availability of P is controlled by three primary factors—
1. Soil pH and mineralogy,
2. Content of organic matter, and
3. Placement of P fertilizer.
Lime should be applied to acid soils to achieve an ideal pH level (pH of 6 to 7). Low soil pH severely limits the availability of P for plant use.
https://www.nature.com/articles/s41597-023-02751-6
https://www.sciencedirect.com/science/article/pii/S2352340922009921
https://www.researchgate.net/publication/365931411_Dataset_for_the_determination_of_phosphorus_in_soil_through_the_analysis_of_hyperspectral_images
Soils that have high concentrations of the hydrous oxides of Al and Fe tend to be acidic and highly P-sorbing. These constituents and some clays may also be active in neutral to alkaline soils.
A lot of work was done on P fixation in Indian soils and most;y published in J.Indian Soc.Soil Sci.A compilation of the work done is available in the form the following publication.
Phosphorus fixation and management in Indian soils.
J.S.Kanwar and D.D. Reddy Published by ICAR Govt. of India 2003.
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