The purpose to ask this question is just to know that if the phosphorus is present in water soluble form in any kind of phosphatic fertilizer then why we don't go for water soluble phosphorus estimation from that material.
There also we go for other estimation methods.
I tried to estimate water soluble phosphorus from SSP but there also I didn't get the actual results.
As we know that SSP contains 14 % of the water soluble phosphorus but I got 6 % of the WSP during that estimation.
I didn't get the probable reason.
The question is not well formulated. What do you mean: "I tried to estimate water soluble phosphorus from SSP."
My comments are based on my understanding of your question.
From the general chemical point of view the answer is trivial. If a fertilizer is well soluble in water, then it will be quickly washed out from the soil and go to the closest river/lake/sea. Therefore, the nutrients for plants must be slow releasing.
Thanks Yurii sir for giving an answer .
Actually I meant to say why don't we go on only water soluble basis while considering the content in fertilizers.
We analyse the nutrients on total content basis from fertilizer and the claim is always on the basis of available nutrient content.
So whenever we apply the fertilizer into the soil the nutrients available to the soil is always only water soluble remaining nutrients be available later on.
Sir Thats why I asked why we consider that content instead of water soluble only.
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