Organic manures comprise all animal and vegetable matters which are used to fertilize the soil, such as dung, muck, etc.
Inorganic manures are those which are of a purely mineral character, such as lime, ashes, etc.
Atmospheric manures consist of those organic manures which are in the form of gases in the atmosphere, and which are absorbed by rains and carried to the soil. These are of immense importance. The ammonia and carbonic acid in the air are atmospheric manures.
FOOTNOTES:
[U] Silicate of potash.
CHAPTER II.
EXCREMENTS OF ANIMALS.
Of what is animal excrement composed?
Explain the composition of the food of animals.
What does hay contain?