Earlier I mentioned about pH papers. Here is a web site that confirms this Site say's only meters are accurate enough http://www.wtw.com/eng/phm/phm.htm While finding this site, I came across this one, It has some interesting ways to adjust soil pH. Please do ask me about mixtures I don't know. I would think that most mixtures would leach out after a few rains. Interesting info on soil PH http://www.milwaukeemeters.com/pHconeng.html