Chemical substances which increase the fertility of the soil are known as _______.

weedicides

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manures

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fertilisers

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pesticides

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Solution

The correct option is C fertilisers
Fertiliser is a man-made chemical substance which is rich in plant nutrients. It is widely used in agriculture to replenish soil with nutrients. It enables higher yield in crops.
Examples of fertilisers include NPK, super phosphate, ammonium sulphate, urea, potash, etc.

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Which of the following increase the fertility of soil ?

A. Lactobacillus bacteria B. Rhizobium bacteria C. Spirogyra algae D. Blue-green algae

(a) A and B (b) B and C (c) A and D (d) B and D

To increase soil fertility, the organic substances obtained from the decomposition of animal wastes are added. This is known as __.

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