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What's the difference between superphosphate and triple
super phosphate fertilizer?
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Answer Posted / paul christy
Superphosphate, 0-20-0, is made when rock phosphate is
treated with sulfuric acid to make calcium phosphate
(0-20-0) and calcium sulphate (gypsum.) Triple
Superphosphate, 0-46-0, is made by treating rock phosphate
with phosphoric acid. Triple Superphosphate has a much
higher phosphate content, as indicated by the 0-46-0
indicating 46% phosphate content. The benefit of the Triple
is that less needs to be used. However it costs more and
there is some evidence to suggest it ties up available
micronutrients (zinc, manganese, iron)in the soil requiring
the grower to supplement them.
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