ABSTRACT
Accordingly there are 16 elements essential for plant growth. They are carbon, hydrogen and oxygen called primary nutrients, calcium, magnesium and sulphur called secondary nutrients; iron, zinc, manganese, copper, boron, chlorine and molybdenum are known as micronutrients. Soil fertility has been considered in the past in restricted sense as a physicochemical phenomenon or as an index of available nutrients for the plants but the modern usage of the soil to produce crop of economic value to man and maintain the health of the soil to future use. The continued capacity of soil to function as vital living system, within ecosystem and land use boundaries, to sustain biological productivity, maintain the quality of air and water environments and promote plant, animal and human health. Soil quality rating is used as a tool to evaluate farming practices which maintain or increase soil organic matter and enhance the biological process that improved physical condition of the soil.
