As we know, As and P can compete with each other for soil adsorption as well as for plant uptake. How can we predict As phyto-availability upon fertilization with a P source?
You are right. There is a antagonistic effect between As and P in soil as well plant system. Application of P compost reduced the uptake of As by Chinese brake fern from soil environment. If we want to predict As phytoavailabilty then you should skip the P fertilization treatment from the designed experiment. Different technique of prediction of phytoavailabity are there like from plat uptake data you can predict As phytoaavilabilty. Water soluble and exchangable As also predict the bio availability of this metaloid.
If you want to obtain some useful data on this subject, I recommended to use hydroponic cultures with 1 or 2 As concentration of your interest and then test different P concentration using the fertilizar you are interesting in (firstable, you have to control the real total and available P concetration in the fertilizar you are going to use, these quantities varies between the commercial products). Then you can estimate the influence of the P added on As availability and transfer. There are an antagonistc effect
There is an antagonistic effect between As and P. I noticed this when analyzing variants fertilized with sewage sludge and with phosphorus from mineral fertilizers.
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