Fertilizers: Chemical versus Organic.
A natural fertilizer is one that consists of some
natural earth product which may be processed
mechanically, but is not treated with acids
or substances to increase its solubility.
Phospate rock, finely pulverized, is a natural fertilizer.
 An artificial, chemical fertilzer
 is a combination of some earth
 product  and a strong acid .
 Super phosphate, which is
  made by treating phosphate rock with
 sulfuric acid, is an example.
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A hundred pound bag of superphosphate includes
50 pounds of phosphate rock and 50 pounds of
sulfuric acid.
An organic fertilizer is a mix of plant and
animal residues. These may be fresh residues
or residues which have been accumulated and
have been preserved for long periods of time,
such as peat, marl and limestone.
A raw, organic fertilizer is made up of raw
( unfermented) plant and animal residues.
Or it may be made of raw , organic matter
to which such materials as pulverized phosphate
rock, potash rock ,oyster shell flour and seaweed
have been added; these contain most of the
elements which are apt to have been leached
out of the soil.
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