Which of the following processes reduces soil fertility?

Decaying organic matter

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Crop rotation

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The addition of N

_{2}

fixing bacteria

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Intensive agriculture

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Solution

The correct option is D Intensive agriculture
Intensive agriculture is basically commercial agriculture where chemical pesticides and fertilizers are used to increase the crop yield to gain more profit. Excessive use of these chemicals reduces the fertility of soil by lowering the soil quality. Thus, the correct answer is option D.

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