oa Agricultural Journal of the Union of South Africa - The conservation of soil moisture

Volume 33, Issue 4
  • ISSN :



The three classes of material which go to supplying the sustenance of the vegetable kingdom are water, a certain number of mineral salts, and carbonic acid gas together with a small quantity of nitrogen; we can thus conveniently divide plant food into the three states of matter, solids and liquids, and gases.

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