ABSTRACT
This chapter focuses on the factors that influence microorganisms in soil; some of the methodology used to study these factors; and an example of how one factor interacts with others to influence the activity, ecology, and population dynamics of microbes in soil. Perhaps the least understood environmental factor that presumably influences microbes in soil is the oxidation-reduction potential. Although many reports on the effects of particulates on microbes are conflicting, there is little doubt that the solid phase of soil, especially the clay mineral component, is an important determinant of the activity, ecology, and population dynamics of microbes in soil. The chapter demonstrates briefly how the activity, ecology, and population dynamics of microbes in soil can be influenced, both directly and indirectly, by a single environmental factor expressing its influence alone and in concert with other factors. It emphasizes that, because the study of microbes in soil is complex, an integrated method of investigation must be employed.
