Perennial biofuel crops’ water consumption similar to corn

Read the full story from Michigan State University.

Converting large tracts of the Midwest’s marginal farming land to perennial biofuel crops carries with it some key unknowns, including how it could affect the balance of water between rainfall, evaporation and movement of soil water to groundwater.

In humid climates such as the U.S. Midwest, evaporation returns more than half of the annual precipitation to the atmosphere, with the remainder available to recharge groundwater and maintain stream flow and lake levels.

A recent study from the Great Lakes Bioenergy Research Center and published in Environmental Research Letters looks at how efficiently “second generation” biofuel crops – perennial, non-food crops such as switchgrass or native grasses – use rainwater and how these crops affect overall water balance.

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