About the Cover
This issue's cover: Biological, chemical, and physical extractions of soil organic matter provide widely different fractions. They enable complementary insights into the behavior of organic matter. Upper right: Light microscope image showing the diversity of particles found in the light fraction (E.G. Gregorich). Background: Scanning electron microscope image of fragments in the light fraction, 73× magnification (E.G. Gregorich). Lower left: Two chemically extracted fractions—mobile humic acid (MHA) and the more humified calcium humate (CaHA) (D.C. Olk). These images represent some of the research described in the proceedings of the symposium, “Meaningful Pools in Determining Soil C and N Dynamics,” see p. 967–1035.
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Copyright © 2006 by the Soil Science Society of America.