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Greensand and similar minerals
Andrew Ashley <firstname.lastname@example.org> wrote about Greensand...
> Subject: Spend money on something else
> Finally something came alond to get me to type! Green sand is
> worthless; so don't spend any money on it. Even if it is not your own
> hard earned money. What does Green sand contain? Fine. Is it
> soluable? Will the nutrients be available to your crops? NO! I think
> not, not in this lifetime anyway. Rock powder, granite dust, green
> sand; these don't cut it.
I would agree that in the test-tube, solubility of minerals from
some of these mineral sources might be low. However, over a year
or more, with microorganism activity on the surface of grains
producing micro-local pH variations and other micro-local
chemistry such as oxidizing and reducing conditions, all of which
could contribute to the solution of minerals, I couldn't be as
Soil mineral levels are not just the sum of thousands or
millions of years of slow solution - rainfall would prevent
the build up of any significant levels by washing them into
streams, rivers and the sea. That we do have fertile soils
means that the process of solubilization is continuous.
The point about adding 'sustainable type' minerals is that their
release of minerals IS slow.
The important questions are: how effective the different mineral
improvers / suppliers, and what are the soil conditions that
affect mineral release. These could/should be (and may even
already have been) addressed by some 'hard' (i.e. good) science!
(Dr W.R.Hare email@example.com)