|Conservation of soils can be done by|
|1. Crop rotation|
|3. Terraced cultivation|
|4. Shifting cultivation|
A) 1 and 4
B) 2 and 4
C) 2 and 3
D) 1, 2, 3 and 4
Correct Answer: C
Solution :[c] Whereas crop rotation, fertilizers and terraced cultivation are helpful in conservation of soil, shifting agriculture is harmful for soil. Under shifting agriculture, a small piece of forest land is cleared by felling the trees and cutting the bushes and grasses. These are then burnt as a result of which it is also known as 'slash and burn' agriculture. The ash obtained by burning is mixed with soil which increases its fertility. The crops are grown for a few years and the cultivator shifts to a new site when the fertility of soil is drastically reduced due to leaching, lack of organic matter and adverse effects of burning the vegetation. That is why it is known as shifting agriculture. It is practiced in a two to three year cycle. Sometimes the farmers come back to the abandoned piece of land after 10-15 years and grow crops.
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