Iraq: laboratory manual on soil chemistry

analyse de l'eau analyse de sol anion aniones anions azote besoin nutritionnel calidad del agua cation cationes cations chimie du sol data collection fosforo irrigation laboratoire laboratories laboratorios muestreo necesidades de nutrientes nitrogen nutritional requirements phosphore phosphorus plant tissues plantas plante plants potasio potassium riego sampling soil soil analysis soil chemistry sol suelo tejidos vegetales water analysis water quality