Efficiency of mineral nutrients in different genotypes of spring barley on the soils with neutral and acid reaction

abonos npk acid soils caracteres de rendimiento composante de rendement crop yield cultivos de primavera culture de printemps engrais npk hordeum vulgare nitrogen content npk fertilizers rendement des cultures rendimiento de cultivos root systems sistema radicular sol acide spring crops stems tallo teneur en azote tige yield components