Be sure to read Bart's Editorial Notes at the end.
The question of phosphorous is especially important since most soils
seem to need added phosphorous to get the most benefit from nitrogen
fixing plants (legumes such as clover and alfalfa) which have been
the key to the post-medieval
Hi Doug,
Phosphorus does cycle slowly in the environment. However, I don't think our soils are going to run out anytime soon. It becomes rather tightly bound in the humic acid component of topsoil. Hence it does not show up in most common soil tests. Green manures bring it out by feeding soil
We dealt with that a month ago Doug. It's a red herring, unless you
think CAWKI is doomed without bags of fertiliser bought from BASF
or whoever (which doesn't work anyway, unless you're BASF's
accountant).
... phosphorus deficiencies are for amateurs.
See:
