Carbon and nitrogen in particle size fractions isolated from Danish arable soils by ultrasonic dispersion and gravity-sedimentation [methodology].

analyse de sol arable soils azote carbon carbone carbono danemark denmark dinamarca experimentation experimentos experiments fraccionamiento fractionation fractionnement grosseur des particules nitrogen particle size soil testing soil texture sol arable textura del suelo texture du sol tierras cultivables ultrason ultrasonics ultrasonido