Field And Laboratory Studies of Soils; An Elementary Manual for Students of Agriculture

Cover Field And Laboratory Studies of Soils; An Elementary Manual for Students of Agriculture
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How would the addition of organic matter affect the temperature of a soil?
Discussion: The color of soil is due to three things: (1) The color may come from the original rock particles Fig. 25. — Corn Planted the Same Day. Dark surfaces absorb more heat than light objects.
of which the soil is formed. An example of this is found in white sandy soil from clear quartz sand. (2) The color usually comes from material which sticks to the particles.
The coloring material may be either iron compounds
...or organic matter or both. Red, yellow, blue, and gray soils are colored by some form of iron, and any of these may be darkened by the presence of organic matter.
EXERCISE A-30.
TO SHOW THE EFFECT OF LIME UPON THE SOIL.
Equipment: Two tall bottles or cylinders; a sample of clay soil; a lump of lime.
Method: (1) Make up a small quantity of limewater by dissolving a lump of lime in a glass of water. Add lime until no more will dissolve.
Fill each bottle or cylinder with clear water and add to each a tablespoonful of very fine, dry, clay soil.


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