1. Animal Manure and Byproducts Laboratory, Animal and Natural Resources Institute, U.S. Department of Agriculture, Henry A. Wallace Agricultural Research Center, Beltsville, Maryland 20705, Agricultural Experiment Station, University of Maryland, College Park, Maryland 20742, Laboratory for Biological Ultrastructure, Department of Biology, University of Maryland, College Park, Maryland 20742, and Electron Microscopy Unit, Soybean Genomics and Improvement Laboratory, Plant Sciences Institute, U.S....