Management Controls on Soil Carbon

Farmers have long recognized the organic matter content of a soil as a key attribute of soil fertility. The development of agriculture in temperate regions has exhibited patterns of exploitative soil use followed by the introduction of regenerative practices as soil resources fell to unacceptable levels. In the simplest terms, the level of soil organic carbon (C) in a soil will be governed by the difference between inputs of organic matter and outputs through mineralization, erosion, and leaching. The controls on decomposition processes are, in most respects, more complex and less easily manipulated by management than are inputs of organic matter. Climate and soil differences constrain management options and…