potassium sulfate
zonneveld (Fri, 15 Apr 2005 05:35:41 PDT)

Although Jim is right in stating that potassium sulfate is more or
neutral that does not exclude a change in pH. It strongly depends
on what is used first or fastest. If the potassium is used fastests
the soil will acidify , if the sulfate is used fastest the soil will
become alkaline. An example: depending on the nitrogen source
the pH in a petridish with fungal grow will turn acid neutral or basic.
If ammoniumsulfate is ued the agar turns acid , if Sodium nitrate is
used the agar turns alkaline , if pepton is ued the agar stays more
or less neutral. I would not use a single salt, choose a well
balanced mix suitable for what you wants i.e with high nitrogen for
growth or low nitrogen for flowers and ripening
Ben J.M.Zonneveld
Institute of Biology,Leiden University, Clusius lab
Wassenaarse weg 64, 2333 AL Leiden, The Netherlands
Zonneveld@rulbim.Leidenuniv.NL
Fax: +31-71-5274999. min temp -10C (15F)