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A polyculture of wheat grown with walnut trees produces ~ 40% higher yields.

1 hectare of wheat/walnut mix yields the same as 1.4 hectares of each crop grown separately.

This is an example of overyielding.

A polyculture of wheat grown with walnut trees produces ~ 40% higher yields. 

1 hectare of wheat/walnut mix yields the same as 1.4 hectares of each crop grown separately.    

This is an example of overyielding.
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