Concept of Soil Fertility and Productivity Fertility in Tropical Soils, N, P, K and S Content in Soils and their physiological role in plants Their forms and transformation in soils Fertilizer and Fertilizer Management, their Manufacturers, Sources, Application Methods, Rates and Timing, Handling and Storage of Fertilizers. Fertility Evaluation and Fertilizer Recommendations for Crops Radioisotopes in Soil/Plant System Crop Growth and Response to Soil Nutrients Absorption, Maintenance and Los...