ABSTRACT
Several techniques are commonly employed to assess the fertility status of the soils. A proper evaluation of the fertility of a soil before planting of a crop helps in adopting appropriate measures to make up for the shortcoming and ensuring a good crop production. Sensor based plant tissue analysis is an indirect measurement of some nutrient proportion in plant tissue. The biological methods consist of raising a crop or a microbial culture in a field or in a sample of the soil and estimating its fertility from the volume of crop or microbial count. If, plant growth or microbial growth is found to be satisfactorily than the soil is considered as fertile soil. Recently Diagnosis Recommendation Integration System (DRIS) is suggested for fertilizer recommendation. In this approach, plant samples are analyzed for nutrient content and they are expressed as rations of nutrients with others.
