Corn cobs may perform better than woodchips to reduce nitrates in water quality bioreactors and for a lesser cost state Iowa State University researchers. The challenge is getting
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Penn State researchers recently opened sealed jars of soil samples collected on campus in 1915 and 1933. Because the samples were taken before many of the changes in agricultural and industrial practices throughout the past century, they offer scientists the chance to study how these changes have affected the microorganisms that live within the soil.