The persistence and movement of chemicals after application to a land
surface in the southern region of the United States are influenced by geography,
geology, climate, landuse/landcover, soil factors, chemical factors, and
management factors. Relationships among these factors are grouped according
to the major land resource areas (MLRA). An MLRA is a geographic associated
land resource area that is characterized by particular patterns of soils,
climate, water resources, and landuse. Factors that affect the transport
of water and chemicals after application to a land surface in the southern
region are described with emphasis on soil factors within an MLRA. Examples
are presented of the persistence and movement of water and tracer chemicals
in the dominant soils within an MLRA.
Reports of all Southern Region Agricultural Experiment Stations serve
people of all ages, socio-economic levels, race, color, sex, religion,
national origin, and the handicapped.