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I know I should know the answer but say you were putting on 250kg/ha of 21n 24s what is the actual amount of sulphur applied?
No, rape will love that rate, 60kgs/ha, just right, abit north of that rate here.http://www.smart-fertilizer.com/articles/fertilizer-composition
According to this link, ammonium sulphate is 21% N 73% SO4 to give you your 24% S.
@lincolnred is right. That is a massive dose of S.
I know I should know the answer but say you were putting on 250kg/ha of 21n 24s what is the actual amount of sulphur applied?
Ammonium Sulphate is 21%N 60%SO3, your analysis is correct but to convert Sulphur to Sulphate (SO3) multiply by 2.5. Fertilser recommendations will be quoted as SO3. You have actually applied 150Kg/Ha of SO3.