The topics addressed in volume 20 of this well-reviewed series Physical Fractionation of Soil and Organic Matter in Primary Particle Size and Density Separates.- Soil Water Repellency.- Stem-Nodulating Legume-Rhizobium Symbiosis and Its Agronomic Use in Lowland Rice.- Nutrient Transformations in Soils Amended with Green Manures.
Bobby Alton Stewart, Ph.D., is Distinguished Professor of Agriculture and Director of the Dryland Agriculture Institute at West Texas A&M University, Canyon, Texas. Prior to joining West Texas A&M University in 1993, he was with the USDA Agricultural Research Service in Oklahoma, Colorado, and Texas. He served as Director of the USDA Conservation and Production Laboratory at Bushland, Texas from 1968 to 1993.