[The results of the agrochemical investigation of the soil]

analyse de sol analytical methods campo champ farmland fields fosforo labranza latvia letonia lettonie magnesio magnesium meadows organic matter pastizales pastures ph del suelo ph du sol phosphore phosphorus potasio potassium prados de siega prairie de fauche recherche research soil chemicophysical properties soil ph soil testing soil texture technique analytique terre agricole textura del suelo texture du sol tillage travail du sol