Effect of sink size on photosynthesis and carbohydrate content of leaves of three spring wheat varieties [partitioning, source, fructans, hexose]

azote carbohydrate content contenido de carbohidratos disponibilidad de nutrientes distribution fertilisation fertilizer application feuille fructosa fructose glucosa glucose hojas leaves monosaccharide monosaccharides nitrogen nutrient availability photosynthese photosynthesis saccharose sucrosa sucrose teneur en glucides triticum aestivum variedades varieties