Under natural vegetation,about 60 to 90% of soil organic matter is in the _____fraction.

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Passive fraction of soil organic matter is the largest and most stable fraction, representing about 60 to 90% of total organic matter in natural vegetation. It consists of highly decomposed plant and animal residues that are physically and chemically protected from further breakdown. The active fraction of soil organic matter is the smallest and most labile fraction, representing less than 5% of total organic matter. It consists of fresh plant materials and recently decomposed organic matter that is readily available for microbial decomposition. The slow fraction is intermediate in size and stability and represents about 5 to 35% of total organic matter.

Under Natural Vegetation,about 60 to 90% of Soil Organic Matter