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Soil Organic Matter
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Organic matter present in soil ranges from dead plant and animal material, organic debris, microbial debris and all stages of humus. Humus is processed and condensed organic matter and it takes thousands of years to reach a stable form. Humus contributes to the activity in soils and consists of humic acid (or humates, the salts of humic acids), fulvic acid (or fulvates, the salts of fulvic acid) and humins (a very stable form).