Question

Compost manure is produced from
A.Farmyard manure and green manure
B.Farm refuse and household refuse
C.Organic remains of biogas plants
D.Rotted vegetables and animal reuse.

Answer 1

Hint: Soil fertility on the surface of earth is not uniform. They are greater in some regions and poor in others. So, farmers adopt several methods to increase the fertility of the soil. One such method is using compost manure.

Complete answer:
 We know that there are several bacteria present in the soil that are able to decompose organic matter. These microbes are called decomposers. They break down complex organic substances into simpler inorganic forms. This process is called decomposition.
Usage of compost manure is adopted by many farmers as a substitute for chemical fertilisers.
Compost manure is prepared from rotted vegetables and animal refuse which is degraded by microorganisms present in the soil. Household kitchen waste is normally used to prepare this. Know that it should not contain non-degradable substances like plastics and chemicals that disrupt the degrading process. The compost manure thus obtained is rich with nutrients and minerals needed for plants.
Continuous use of these chemical fertilisers decrease the mineral content of the soil and cause the depletion of soil fertility overtime. It also causes acidification of soil that kills microbes that are present in the soil and are beneficial to plants. So we must use compost manure and other organic forms of fertilisers for agricultural purposes.

Hence the correct answer is OPTION(D)

Note: Compost manure increases the porosity of the soil. Porosity is the water holding capacity of soil. Manure also increases the nutrient richness of the soil and also have properties that reduce soil erosion.
Also note that manure can be used to drain excess water from clay soil.