By planting trees in arable land, farmers can improve crop yields, prevent soil erosion, promote biodiversity and provide a source of energy. Rapidly-growing trees such as poplars and willows can be harvested after just a few years, and if the roots are left intact, they will soon grow back again.
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Agroforestry, as it's called, dates back centuries, but now it's being rediscovered. Scientists in Germany are currently investigating whether it could be a good way to improve farming in the future.