Water may be considered an atmospheric manure, as its chief supply to vegetation is received from the air in the form of rain or dew. Its many effects are already too well known to need farther comment.
The means of supplying water to the soil by the deposit of dew will be fully explained in [Section IV.]
CHAPTER XI.
RECAPITULATION.
Manures have two distinct classes of action in the soil, namely, chemical and mechanical.
Chemical manures are those which enter into the construction of plants, or produce such chemical effects on matters in the soil as shall prepare them for use.
Mechanical manures are those which improve the mechanical condition of the soil, such as loosening stiff clays, compacting light sands, pulverizing large particles, etc.
What are the three kinds of manures?
What are organic manures, and what are their uses? Mineral? Atmospheric?
Manures are of three distinct kinds, namely, Organic, mineral, and atmospheric.