ok good. I've not seen it available here, possibly because we have acid
soil to start with.

"jc" wrote in message
...
...
what they're using is 21% N (nitrogen) .... and thus it's 79%
inert matter which might be rock dust, etc. to give you more bulk to
work with when spreading it. ...

Ammonium sulfate also contains 24 % sulfur which helps to lower the pH
and thus help with nutrient uptake in alkaline soil.

Olin