Freezing as an aid in the drying and purification of humus and allied materials.
D001190:Arylsulfonates; D003890:Desiccation; D005615:Freezing; D012987:Soil
D001190:Arylsulfonates; D012987:Soil; C050296:metsulfuron methyl
HUMUS/purification, by freezing