CHAPTER XXVI
NITROGEN AND ITS RELATION TO PLANTS
244. Nitrogen. A substance which plays an important part in animal
and plant life is nitrogen. Soil and the fertilizers which enrich it,
the plants which grow on it, and the animals which feed on these, all
contain nitrogen or nitrogenous compounds. The atmosphere, which we
ordinarily think of as a storehouse of oxygen, contains far more
nitrogen than oxygen, since four fifths of its whole weight is made up
of this element.
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