ABSTRACT
The emphasis Plant and microbial relationships are affected by the total biophysical system of both the plant and the soil. Once the root occupies an area of the soil, it affects and is affected by the microorganisms of that region. Thus, the root has an immediate effect on the microbial ecology of the soil. Microbially produced growth regulators may also stimulate increased total growth of the plant. In addition to microbial effects, physical and chemical factors such as soil texture, structure, color, organic content, water status, pH, and salinity play major roles in the expression of rooting potential. Biological nitrogen fixation is certainly among the most important rhizosphere processes. Soil structure is important to the rate and extent of root development in subsequent crops, and the interaction of rhizosphere bacteria and fungi are critical. The holistic understanding of rhizosphere microbial ecology has become vitally important to soil management and plant growth.
