Agriculture Reference
In-Depth Information
Figure
9.1.
Soil profile on the larger of Donio's corn farms. Because all organic matter is
removed after harvest, there is no obvious A horizon in the soil on this farm. The profile is
highly uniform at the dept of 1 m. (Courtesy of Henry Goltiano.)
In the United States incorporation of organic matter coupled with lower rainfall
and cooler temperatures during the spring, fall, and winter are conducive to buildup
of organic matter and the development of a prominent A horizon; see Figure 9.3. Vari-
ations in color of the B horizons shows that there is poor water drainage in this soil.
Figure
9.2.
Soil profile on farm of A
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da and Octavio.
