[The dressing of citrus fruit trees]

agricoltura biologica agriculture biologique analisi del terreno analyse de sol application date application foliaire application rates azote azoto besoin nutritionnel carenze minerali chemical composition cinc citrus composition chimique composizione chimica contenido mineral date d'application deficiencia de minerales dose d'application dosi di applicazione epoca di trattamento fer ferro fertilisation fertilizer application feuille foglie foliar application fosforo hierro hojas integrated plant production iron leaves magnesio magnesium manganese manganeso mineral content mineral deficiencies necesidades de nutrientes nitrogen nutrition des plantes nutritional requirements nutrizione delle piante organic agriculture phosphore phosphorus plant nutrition plant soil relations potasio potassio potassium produzione vegetale integrata relaciones planta suelo relation plante sol relazioni pianta-suolo sintomi soil chemicophysical properties soil testing symptome symptoms zinc zinco