“Soil Humus”
Organic matter benefits soil productivity not because it is present, but because all forms of organic matter in the Soil Humus, including its most stable form—humus—are disappearing. Mycorrhizal fungi and beneficial bacterial colonies around plant roots can exist only by consuming soil organic matter.
The slimes and gums that cement soil particles into relatively stable aggregates are formed by microorganisms as they consume soil organic matter. Scats and casts that are soil crumbs form only because organic matter is being consumed. If Soil Humus declines, the entire soil ecology runs down and with it, soil tilth and the health and productivity of plants.
If you want to manage your garden soil wisely, keep foremost in mind that the rate of humus loss is far more important than the amount of humus present. However, natural processes remove humus without our aid or attention while the gardener’s task is to add organic matter. So there is a very understandable tendency to focus on addition, not subtraction. But, can we add too much? And if so, what happens when we do? Read more…
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