Phosphoric acid is in the form of H3PO4 remained free while manufacturing of SSP fertilisers. So far Quality of fertiliser is concerned the free phosphoric acid should be less than >4% as it has low pH (less than 2) which might cause damage to roots and foliage/stem etc. is it the only reason to worry?
Because strong acids kill any living thing. You may think that 4% phospkoric acid is not strong - I would bet its pH is about 0.
Due to the facts that strong acid is corrosive, lesser concentration is needed to avoid damage to the plants roots, if not the plant will develop stunted growth instead of an advanced physical growth
Phosphoric acid in the form of ammonium or sodium phosphate acts as a fertilizer being water soluble , however phosphoric acid is stronger tri-basic acid leads to the burning of the crops due to higher PH value.
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