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Humans is essential for plant growth because |
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a) |
It is rich in nutrients and increases the water holding capacity of soil |
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b) |
It increases aeration of soil |
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c) |
It increases porocity of soil |
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d) |
All of the above |
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Humans is essential for plant growth because |
|
|
a) |
It is rich in nutrients and increases the water holding capacity of soil |
|
b) |
It increases aeration of soil |
|
c) |
It increases porocity of soil |
|
d) |
All of the above |
|
(d) Humus is the dark-colored amorphous colloidal material that constitutes the organic component of soil. It is formed by the decomposition of plant and animal remains and excrement and has a complex and variable chemical composition. Being a colloid, it can hold water therefore improves the water retaining properties of soil. It also enhance soil fertility and workability. |