Soil Fertility indicates the strength or the ability of the soils to provide nutrients to the plants. Most of the plant nutrition comes from the organic content. A small but vital portion of the nutrition is provided by - the trace elements or micronutrients. Organic content of the soils is developed and maintained by the friendly bacteria present in the soils. These bacteria digest the agricultural or other organic wastes. The degradation products of the organic wastes improve fertility of the soils.