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accumulation acid activity aeration Alternative Agriculture v7 amount analysis animal applied atmosphere autotrophic available phosphate bacteria base cations biological bone meal C:N ratio calcium carbon compounds CARBON CYCLE carbon dioxide cause chapter chemical colloidal components compost contain create crops decay decomposed decomposition depletion earth effect energy environment erosion eventually exist factors fertilizer figure fungi green manures growth horticulture humates humic humus hydrogen increase inorganic insects ions lime living magnesium manure microbes microorganisms moisture level natural organic needed nitrate nitrogen nutrients occur organic carbon organic certification organic nitrogen oxygen percent pest pest organisms phosphorus pile plants populations potash potassium problems production protein residues rock phosphate roots salt sample sand soil organic matter soil particles soil pH Soil Science soil system Soil Testing Laboratory soil's soluble species suction sulfate sulfur trace elements utilized Waksman weathering weeds Yei No Yei Yei Yei