Verification of the nitrogen fertilization methods of winter wheat

application rates besoin nutritionnel calidad contenido proteico crop yield cultivo intercalado cultivos de invierno culture d'hiver culture intercalaire dose d'application essai fertilidad del suelo grain granos intercropping localisation des productions necesidades de nutrientes nitrate nitrates nitratos nutritional requirements periodo vegetativo production location protein content pruebas quality rendement des cultures rendimiento de cultivos site factors soil fertility trials triticum aestivum vegetative period winter crops