The effect of rate, form and timing of fertilizer N on nitrogen uptake and grain N content in spring malting barley

abonado fraccionado abonos abonos nitrogenados absorption de substances nutritives ammonium nitrate ammonium sulphate application date azote barley calcium nitrate cebada cebada cervecera chemical composition choix de la date composition chimique date de traitement efficiency eficacia engrais fecha de tratamiento fertilizers grain granos malting barley mineral nutrients nitrate d'ammonium nitrate de calcium nitrato de amonio nitrato de calcio nitrogen nitrogen fertilizers nutrient uptake nutrientes minerales orge orge de brasserie split dressings sulfate d'ammonium sulfato de amonio timing treatment date trigo uses usos utilisation wheats