How about a recipe for whoopee cakes?
Tapla, thankyou for the Whitcomb lead. I'm almighty ignorant when it comes to plants, so I had a ferret around for some of his literature. I didn't have much luck, but I did find a paper that helped me appreciate your sense of things.
Wright, A.N. (1998) Influence of Lime and Micronutrient Amendments on Growth of Containerized Landscape Trees Grown in Pine Bark (unpublished master's thesis). Faculty of Virginia Polytechnic Institute and State University, Blacksburg, Virginia. Retrieved from http://scholar.lib.vt.edu/theses/public/etd-7598-11410/materials/anwthesis.pdf
I can't vouch for its veracity, but the short literature review does give me some perspective. The studies she references do seem to corroborate at least something of your understanding of pH. It's a fascinating business, this science.
But have a look at this.
'Results of this thesis indicate that lime additions to pine bark are not necessary to improve growth of containerized landscape trees and in many cases produced detrimental results. Lime additions were also not necessary to supply Ca and Mg, since the irrigation water supplied sufficient concentrations of these nutrients. Instead, micronutrient amendments are necessary and greatly improved seedling growth and quality, regardless of substrate pH' (Wright, 1998, p. 42)
Isn't that interesting! I mean that in an excitable neophyte kind of way. It goes without saying that these results are dependent on some well defined variables.
Thanks again.