Biology (NTSE/Olympiad)  

3. Improvement In Food Resources


Manures and fertilizers :
Manures :
Manure are organic substances obtained from the decomposition of animal wastes, like cow dung and vegetable wastes by the action of microbes.
Types of Manures :
(i) Farmyard Manure (FYM) -
It is formed by the decomposition of a mixture of cattle excreta (dung), urine of cattle, litter and roughage.
By the action of micro-organisms all these materials decompose and are used as farmyard manure (FYM).
(ii) Compost :
Compost is a biological process in which the above mentioned organic matter is decomposed by both aerobic and anaerobic micro-organisms.
(iii) Green Manuring :
The practice of green manuring includes growing turning or ploughing and mixing of green crops with soil to improve physical structure and soil fertility.
Green manures may include both leguminous and non leguminous plants.


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