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
Correct Answer: D
Solution :
[d] Humus is the organic material in soil is the dark brown or black colouration. In soil science, humus refers to any organic matter which has reached a point of stability, where it will break down no further and might, if conditions do not change, remain essentially as it is for centuries, if not millennia. In agriculture, humus is sometimes also used to describe mature compost, or natural compost extracted from a forest or other spontaneous source for use to amend soil. It is also used to describe a topsoil horizon that contains organic matter (humus type. humus form, humus profile).
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