[Effect of fertilizing on yield components, quality and yields of grain crops in highland production region]

abonos nitrogenados abonos npk avena caracteres de rendimiento composante de rendement contenido proteico crop yield cultivos de invierno cultivos de primavera culture d'hiver culture de printemps engrais npk facteur de rendement factores de rendimiento farmyard manure fumier grain granos harvest index hordeum vulgare nitrogen fertilizers npk fertilizers paille paja protein content rendement des cultures rendimiento de cultivos secale cereale site factors solanum tuberosum spring crops straw trifolium triticum aestivum winter crops yield components yield factors