Lessons in Agriculture I
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The richer the soil in organic matter, other things being equal, the lighter it will be. Subsoils are as a rule heavier than surface soils because they contain less humus. The specific gravity of soils also varies widely.
The average for surface soils is about 1.2 and for subsoils about 2.0. This means, since specific gravity indicates weight as compared with the weight of an equal volume of water, that surface soil is about 1.2 times as heavy as water and subsoils about twice as heavy. The spe...cific gravity of soils is less in proportion, as they contain more air. The presence of porous materials for this reason decreases the specific gravity. Organic matter is the most porous of the common constituents of soils. If, therefore, it is found that the specific gravity of a soil is low we may usually safely conclude that the soil is rich in humus; but if the specific gra\ity is high we conclude that the soil is poor in humus.
90. Color — The color of a soil depends upon its composition and is therefore a \aluable indication as to the nature of the soil.
What to read after Lessons in Agriculture I?
You can find similar books in the "Read Also" column, or choose other free books by Brooks, William Penn, 1851- to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The richer the soil in organic matter, other things being equal, the lighter it will be. Subsoils are as a rule heavier than surface soils because they contain less humus. The specific gravity of soils also varies widely.
The average for surface soils is about 1.2 and for subsoils about 2.0. This means, since specific gravity indicates weight as compared with the weight of an equal volume of water, that surface soil is about 1.2 times as heavy as water and subsoils about twice as heavy. The spe...cific gravity of soils is less in proportion, as they contain more air. The presence of porous materials for this reason decreases the specific gravity. Organic matter is the most porous of the common constituents of soils. If, therefore, it is found that the specific gravity of a soil is low we may usually safely conclude that the soil is rich in humus; but if the specific gra\ity is high we conclude that the soil is poor in humus.
90. Color — The color of a soil depends upon its composition and is therefore a \aluable indication as to the nature of the soil.
What to read after Lessons in Agriculture I?
You can find similar books in the "Read Also" column, or choose other free books by Brooks, William Penn, 1851- to read onlineMoreLess
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