On Tue, 21 Mar 2006 09:37:04 +0000, Derek Turner
wrote:

Rupert wrote:

Interesting:- Looks like JI ericaceous is similar to JI seed compost .The
difference is that limestone is replaced with sulphur to give a higher pH.
I have never used JI but I suppose perhaps I end up making something
vaguely similar by mixing soil with bog standard seed and potting compost.



Make that a LOWER pH. pH7 = acid pH7 alkaline. p stands for 'minus
logarithm to the base 10', and H the concentration of hydrogen ions (if
you are interested). So the higher the H+ concentration the lower the pH


The mantra I have is "the logarithm (to the base 10) of the reciprocal
of the hydrogen ion concentration in moles per litre"

Same as yours but differently expressed.


--
Chris

E-mail: christopher[dot]hogg[at]virgin[dot]net