Proceedings of the Third International Symposium on Genetic Aspects of Plant Mineral Nutrition, June 19-24 June, 1988, Braunschweig, GermanyGenotypic variation in plant productivity and consequences for breeding of low input cultivars.- Session 1: Physiological and biochemical mechanisms associated with genetic variation in utilization of a) nitrogen, b) phosphorus and c) other major nutrients.- Factors affecting the nutritional efficiency of plants.- Physiological basis of genotypic plant distinctions in mineral nutrition.- Concentrations of N, P, and K and dry matter mass in maize inbred lines.- Accumulation and translocation of nitrogen in cultivars of winter wheat with different demands for nutrition.- Uptake and partitioning of nitrogen in nitrogenlimited barley: Dependence of age and genotype.- Dry weight production and nitrogen efficiency in cultivars of barley and rye.- Nitrate reductase in sugar beet genotypes supplied with different nitrate levels.- Influence of the nitrogen level on root growth and morphology of two potato varieties differing in nitrogen acquisition.- Phosphorus efficiency and phosphorus remobilization in two sorghum (Sorghum bicolor (L.) Moench) cultivars.- Responses to phosphate fertilizers of differing solubilities by white clover cultivars.- Genotypical differences among graminaceous species in release of phytosiderophores and uptake of iron phytosiderophores.- Investigations on the nutrient uptake efficiency of different grape root-stock species and cultivars.- Heritability of root characteristics affecting mineral uptake in tall fescue.- Root traits of maize seedlings indicators of nitrogen efficiency?.- Varietal differences in root Phosphatase activity as related to the utilization of organic phosphates.- The effect of shoot and root genotype on phosphorus concentrations of shoots and roots.- Carbohydrate status in roots of two soybean cultivars: A possible parameter to explain different efficiencies concerning phosphate uptalh