title: A versatile soil percolator.
abstract: A simple multiple column soil percolator is described. Individual columns operate in parallel and are independent. The apparatus may be operated by pressure or suction. An experiment on the effects of pesticides on nitrification in the percolator is described.
mesh_terms: D001419:Bacteria / Q000187:drug effects* / Q000378:metabolism; D001431:Bacteriological Techniques / Q000295:instrumentation*; D007306:Insecticides / Q000494:pharmacology*; D009584:Nitrogen / Q000378:metabolism*; D012988:Soil Microbiology
chemical_list: D007306:Insecticides; D009584:Nitrogen