The response to fertilizer nitrogen of cereals grown on sandy soils

abonos abonos nitrogenados agua del suelo azote barley cebada cereales cereals cultivos de invierno culture d'hiver eau du sol efficiency eficacia engrais fertilizers hordeum vulgare modele modelos models nitrogen nitrogen fertilizers orge sandy soils soil water sol sableux suelo arenoso trigo triticum triticum aestivum uses usos utilisation wheats winter crops