Criteria of classification for plant nutrients : Macronutrients: N, P, K,, Mg, Ca, Micronutrients. Fe, Zn, Mn, Mo, B, Cu, CoS, Benificial nutrients Na, Cl, Se, Role and function of essential nutrients in plant, Soil fertility evaluation, Management of Fertilizers Application, Cropping systems and soil fertility, Crops rotation, Legumes in Crop rotation, Fertilizers & efficient use of water, Nutrients cycles and balance in nature.