Crop residue
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Crop residues are waste materials generated by agriculture. The two types are:
Stubble field in Brastad, Sweden
Humus form
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Humus form is the features of the topsoil and plant litter in a biome, such as mull humus form in deciduous forest or mor humus form in coniferous forest. Dead organic matter, such as leaves, decompos
Mull humus profile in an oak forest
Moder humus profile in an oak forest