This well-known series presents reviews of current research on all aspects of soil science. Volume 18 contains articles dealing with soil denitrification, the effects of soil freezing on its chemical and biological properties, the behavior of phosphorus in soil and the response of crops to phosphorus, and the distribution and management of drylands in the People's Republic of China.
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.