The grain yield in winter wheat influenced by changes in the contents of nutrients, sugars and dry matter in the stage of grain formation

absorption de substances nutritives azucares condiciones ambientales condition de milieu contenido de materia seca cultivos de grano cultivos de invierno culture d'hiver dry matter content environmental conditions espigas feuille glucosa glucose grain crops hojas leaves metabolism metabolisme metabolismo nutrient transport nutrient uptake spikes sucres sugars transport des substances nutritives transporte de nutrientes triticum variedades varieties winter crops