Question

dead organic matter which makes the soil less fertile
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Answer 1

Answer:

here you go

Explanation:

Factors that cause or contribute to soil infertility include nutrient mining, removal of crop residue, erosion, incorrect soil pH, salinity and natural disasters.

Answer 2

More precisely, humus is the dark organic matter that forms in soil when dead plant and animal matter (including aerobic compost) breaks down further, specifically through the action of anaerobic organisms. Humus has many nutrients that improve the health of soil, nitrogen being the most important.

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