Materials of biological origin which are commonly used to maintain and improve soil fertility are

Green manure

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Biofertilizers

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Bioinsecticides

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Both (a) and (b)

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Solution

The correct option is D Both (a) and (b)
Most soils are naturally fertile but to maintain the fertile nature, fertilizers are needed. Green manure and biofertilizers contains range of nutrients in different proportions which are essential for plants.

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Similar questions

Compare the use of manure and fertilizers in maintaining soil fertility.

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