which of the following help preserve soil fertility
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Soil fertility can be further improved by incorporating cover crops that add organic matter to the soil which leads to improved soil structure and promotes a healthy, fertile soil; by using green manure or growing legumes to fix nitrogen from the air through the process of biological nitrogen fixation.
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U haven't given any options. So I have to give a guessed answer.
U can preserve soil fertility by Multiple Cropping, Crop rotation and also by living that land uncultivated for a long time.
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