KeySoil Range
Soil organic matter content tends to stabilize under sustained management. But there is no fixed level of organic matter content for a particular location - rather there is a range the KeySoil Range which varies depending on soil clay content, land use, management and various environmental factors such as rainfall and temperature. For example, soils under continuous cereals have relatively low organic matter contents when compared with permanent grassland on the same soil. Also if organic matter such as farmyard manure or compost is added regularly to a well-managed soil its organic matter content rises over time and then stabilises at a higher level within the KeySoil Range. Comparing your current soil organic matter content with the KeySoil Range provides an indication of the potential for change for that soil.
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