DAP question

[SBB]

Can someone tell me if there is any difference between DAP "diammonium sulfate" and plan old garden variety Sulphate of Ammonia....from looking around the net it appears not to me. Same thing different name????

[jeracoo]

Pretty sure they're the same thing, as sulphate of ammonia is just diammonium sulfate.

[R-sole]

There'd be at least a minimum difference of the one designed to go in food would be food grade 8-)

[jeracoo]

Very true 5Star, the purity is probably alot lower in the sulphate of ammonia and may have other things added to it that you don't want.

[fields]

Another thing is there is no Phosphate in sulphate of ammonia; it has an npk of something like 18-0-0... read the back of all the fertilizer packets at the large hardware down the road the other day... i read somewhere the other day that DAP has an npk of something like 18-36-0 (don't quote me)

I've been looking into this myself, I was thinking if I could use sulphate of ammonia (no urea which is good) for the nitrogen and rock phosphate and sulphate of potash I should be able to control the exact NPK of anything that people are suggesting on their recipes... lots of people suggest 20-0-0 or 20-20-0 or other options, there is nothing like this that I could find in the fertilizer aisle

[wynnum1]

mineral phosphate fertilizers cadmium.