oo horizonso1o2oaochreptsochric epipedonoe horizonoi horizonoil wastelandoligotrophicoligotrophsomnisepicplasmic fabriconce over tillageone d shrinkageone third atmosphere percentageone third bar percentageooidorgananorganic farmingorganic fertilizerorganic gardeningorganic phosphorusorganic plasmaorganic soilorganic soil materialsorganotrophoriented tillageorthentsorthidsorthodsorthogranic fabricorthophosphateorthoxortsteinosmoregulationosmosisosmotic potential of soil waterosmotic pressureouter sphere adsorptionoutwashoven dry soiloverburdenoverconsolidated soil depositoverlayoxbow lakeoxic horizonoxidation ditchoxidation reduction potentialoxidation state
