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ORIGIN AND NATURE OF SOIL
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acid actinomycetes ammonium molybdate amount ants apparatus arthropods bacteria beaker beetles burrow calcium carbon dioxide cells centipedes chemical chernozem colony color contains crucible cycle decomposers decomposition depth dilution Discussion earthworms ecology effects energy environment erosion factors feed filter paper flask food chains forest fungi green plants heterotrophs horizon humus important insects larvae layer leaching litter living organisms method microorganisms microscope millipedes minerals moist moisture content nematodes nitrogen nutrients Observe occur organic content organic matter oxygen parent material pedalfers pedocals pesticides petri dish phosphorus plants and animals podsol pore space Procedure protozoa pseudoscorpion Recommended Readings Research rock roots Section snails and slugs soil arthropods soil community soil ecosystem soil fungi soil organisms soil particles soil profile soil sample soil types soluble solution species springtails surface temperature termites test tube viruses water-holding capacity weathering worms