FORESTRY
SOIL SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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-lighter in color-has less humus
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-under humus-above subsoil
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-layer below subsoil-is a solid rock
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-under subsoil
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Detailed explanation-1: -B horizon or subsoil – It is the horizon present just below the topsoil and above the bedrock. It contains less humus. Moreover, this layer holds more water than topsoil and is light brown due to the presence of clay soil. C horizon or Saprolite-This layer is made up of broken bedrock.
Detailed explanation-2: -Humus remains and clay accumulate in subsoil, but the teeming macroscopic and microscopic organisms that make the topsoil rich with organic matter spend little time in the subsoil layer. Below the subsoil is a layer of partially disintegrated rock, and underlying bedrock.
Detailed explanation-3: -The thick brown or black substance that remains after most of the organic litter has decomposed is called humus. Earthworms often help mix humus with minerals in the soil. Humus contains many useful nutrients for healthy soil. One of the most important is nitrogen.