Green fallow

fallow whereby land is rendered mellow and clean from weeds, by cultivating some green crop, as turnips, potatoes, etc.

See also: Fallow

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"One option we're exploring is to include forage crops or green fallow. Both use less water than the current crops--wheat, corn, millet, and sunflowers."
Winter wheat yield depression from legume green fallow. Agronomy Abstracts, American Society of Agronomy, Madison, WI.