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Write the various natural methods involved in the replenishment of the soil fertility.


Natural methods involved in the replenishment of the soil ferility are :

(1) Weathering of rocks.

(2) Decomposition of fallen leaves, twigs, dead plants and animals and excreta and their convertion to humus.

(3) Biological nitrogen fixation.

 

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Mention the significance and disdvantages of hydroponics.

Mention the artificial methods involved in the restoration of soil fertility.

 Give the role of minerals.

List the criteria for essentiality of elements.

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