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Earlier discussion
1 older comment kept for context.
Oluwaseun Adeyemi
Humus refers to the fraction of soil organic matter that is amorphous and without the cellular cake structure characteristic of plants, micro-organisms or animals. It is the dark organic matter that forms in the soil when plant and animal matter decays and it contains many useful nutrients for healthy soil, nitrogen being the most important of all. The experiment in the question above was used to determine the presence of humus in the dried soil.