Nutritional Physiology, Ion Uptake Mechanisms of Individual Cells and Roots, Long-distance Transport in the Xylem and Phloem, Yield and Source-Sink Relationships, Functions of Macronutrients, Micronutrients and Beneficial Elements, Nutrition and Quality, Relationship between Nutrition, Plant Diseases and Pests,  Deficiency and Toxicity of Nutrients, Plant-Soil Relationships, Effect of Internal and External Factors on Root Growth and Development, Rhizosphere Biology, Adaptation of Plants to Adverse Chemical Soil Conditions, Nutrient and Carbon Fluxes in Terrestrial Agro-Ecosystems, Precision Agriculture in Plant Nutrition.