Discussion
Triple superphosphate differs from single superphosphate in being made with
Answer: A
Correct answer: phosphoric rather than sulphuric acid
Single superphosphate is rock treated with sulphuric acid, and the calcium sulphate formed dilutes the product to about 16 to 20 per cent available phosphate. Triple superphosphate uses phosphoric acid instead, so no sulphate is produced and the grade rises to around 46 per cent - which cuts the mass to be bagged, shipped and spread for the same nutrient.
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