How much corn crop residue, or stover, can be removed for biofuels without harming soil? An Agricultural Research Service (ARS) study of a 10-mile circle around the University of Minnesota's Morris campus offers some clues.
A still-emerging ethanol industry that has already pushed many no-tillers into continuous corn — and which could eventually lead them to new biomass crops or even selling crop residue — appears to be in an early shakeout period.
Researchers in Tennessee are looking at the feasibility of no-tilling switchgrass, a warm-season perennial that can grow up to 7 feet in height, as raw material for biofuels and an alternative to corn-based ethanol.
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