Soil analysis of phosphorus according to the double-lactate method (DL-Method) in correlation to the P-content in plants

absorption de substances nutritives analyse de sol avena beta vulgaris cultivos de invierno cultivos de primavera culture d'hiver culture de printemps fertilidad del suelo fosforo hordeum vulgare nutrient uptake phosphore phosphorus secale cereale soil fertility soil testing spring crops winter crops zea mays