potassium sulfate

zonneveld zonneveld@RULBIM.Leidenuniv.nl
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
Fax: +31-71-5274999. min temp -10C (15F)

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