The plan comes as bees are dying off in greater numbers.
Bees are essential pollinators of about a third of the country's food supply.
Farmers replacing some crops are hoping to attract and sustain native bees and strengthen dwindling honeybee populations by enhancing their diets.
Researchers suspect a lack of proper nutrition is one factor causing the die-off.
They say bees don't have enough to eat and must be fed supplements on large farms that grow a single crop and rely on pollination.
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Someday trees could provide more than just shade, scenery and building materials.
Purdue University researchers are studying how poplar trees might be turned into liquid fuel.
Scientists are studying whether cellulose from poplars can be used to make ethanol.
Cellulose is considered the next frontier in ethanol production.
Most plants contain more biomass than grain, so cellulose could potentially provide more ethanol than grain.
