Abstract: The concentration of boron in soils and plants not only varies with soil type, plant species and environmental conditions, but also its excess or deficiency may affect the plant growth and production. Because, there is a small concentration range between deficiency and toxicity in soil-plant systems. In the present study, the importance of boron in plant nutrition, its chemistry in soils, its physiological and biochemical role in plants and its relation to environment is reviewed and discussed.