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FEED GRASSES; FEED LEGUMES; NUTRITIONAL REQUIREMENTS; ALUMINIUM; PHOSPHORUS; SOIL FERTILITY; GENOTYPES; GENETIC VARIATION; PLANT BREEDING; ADAPTATION; GRAMÍNEAS FORRAJERAS; LEGUMINOSAS FORRAJERAS; NECESIDADES DE NUTRIENTES; ALUMINIO; FÓSFORO; FERTILIDAD DEL SUELO; GENOTIPOS; VARIACIÓN GENÉTICA; FITOMEJORAMIENTO; ADAPTACIÓN