Question

Distinguish between fertilizer and manure. Give suitable examples. What are advantages and disadvantages of using fertilizer?

Answer 1

Manure	Fertiliser
It is a natural substance obtained by decomposition of animal wastes and plant residues.	It is a man-made substance, generally an inorganic salt or organic compound.
It has a low nutrient content.	It has a high nutrient content.
It is rich in organic matter and adds humus to the soil.	It is rich in inorganic matter and does not contain humus.
It is not soluble in water and hence is absorbed slowly by the plants.	It is soluble in water and is readily absorbed by the plants.
It is cheaper.	It is expensive.

Advantages of using fertilisers:
(i) They are very rich in plant nutrients (nitrogen, phosphorous, and potassium) and helps in proper growth of plants.
(ii) They are an important component for obtaining higher yield of crop plants.
(iii) These are compact and concentrated. Hence, it is easy to store and transport them to the crops.

Disadvantages of using fertilisers:
(i) They generally get washed off by water and pollute the nearby lakes, rivers, and streams.
(ii) They are very costly, and many of the farmers are unable to afford them.
(iii) Continuous use of fertilisers affect soil fertility.