soil science
study of soil as a natural resource on the surface of the earth
soil ecology
study of the interactions among soil organisms, and between biotic and abiotic aspects of the soil environment
soil physics
the study of soil's physical properties and processes
soil biology
study of microbial and faunal activity and ecology in soil
pedology
study of soils in their natural environment
soil chemistry
discipline embracing all chemical and mineralogical compounds and reactions occurring in soils and soil-forming processes
agrology
branch of soil science dealing with agricultural crop production