Soil fertility is reduced by

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Crop rotation

Nitrogen-fixing bacteria

Decaying organic matter

Intensive agriculture

answer is D.

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Detailed Solution

Concept- Soil fertility is defined because of the aptitude of the soil to produce nutrients within the correct quantity and at the correct time, and without toxic chemicals. Soil production is the ability of the soil to provide crops in each area.
Some of the factors which affect soil fertility are:
Style of soil, weather conditions, Vegetation, Topography of soil, Physical conditions of soil, Age of soil, Fertilizing capacity of the soil, Composition of soil, Availability of nutrients, erosion, Agriculture patterns and Environmental conditions.
Crop rotation is an agricultural method of planting different crops sequentially on the identical land to boost the soil conditions. It increases the fertility of soil because the soil is exposed to different nutrients per the sort of crops sown.
Nitrogen-fixing bacteria like Rhizobium and Azospirillum help with nitrogen-fixing within the soil. This increases the nitrogen content of the soil and results in an increase in soil fertility. Decaying organic matter also enriches the soil with nutrients and thus increases soil fertility. Intensive agriculture may be a method by which soil gets harmed and the nutrient content further because the fertility is reduced.
Hence, the correct answer is option 4.

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