The contentious nature of soil organic matter

@article{Lehmann2015TheCN,
  title={The contentious nature of soil organic matter},
  author={Johannes Lehmann and Markus Kleber},
  journal={Nature},
  year={2015},
  volume={528},
  pages={60-68}
}
The exchange of nutrients, energy and carbon between soil organic matter, the soil environment, aquatic systems and the atmosphere is important for agricultural productivity, water quality and climate. Long-standing theory suggests that soil organic matter is composed of inherently stable and chemically unique compounds. Here we argue that the available evidence does not support the formation of large-molecular-size and persistent ‘humic substances’ in soils. Instead, soil organic matter is a… 
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