Response of spring barley varieties to increased nitrogenous nutrition level

abonos nitrogenados abonos potasicos amilasas amylase amylases analyse statistique crude protein engrais potassique ensayos de variedades etapas de desarrollo de la planta hordeum vulgare nitrogen fertilizers nucleic acids plant developmental stages potash fertilizers proteina bruta rendement rendimiento ribonucleasas ribonuclease ribonucleases statistical analysis variety trials yields