[The knowledge of soil [soil characteristics - sugar beet cropping]]

analisi del terreno analyse de sol beta vulgaris campionamento chemical composition composition chimique composizione chimica enfermedades de las plantas fosforo maladie des plantes malattie delle piante muestreo nematoda nitrogen content organisme du sol organismi del suolo organismos del suelo parassiti delle piante pests of plants phosphore phosphorus plagas de plantas plant diseases potasio potassio potassium ravageur des plantes rhizomania rhizomanie rizomania sampling soil soil chemicophysical properties soil organisms soil testing sol suelo suolo teneur en azote