O字彙

ochric epipedon
octahedral sheet
oligotrophic microorganism
oligotrophication
oligotrophy
optical density of oxalate extract value{=OdOe value}
optically oriented clay
oriented adsorption
orterde
orthogonal design
ortstein
oscillation volume
outer sphere complex
outlet
oven-dried soil
over grazing
overconsolidation
overliming
oxic horizon
oxidation reduction potential
oxidizing force of root
oxidoreductase
oxisol
oxygen diffusion rate{=ODR}
oxyphobes

open ditch drainage
open ecosystem

optimum design
optimum model
optimum moisture content

organic carbon
organic carbon-nitrogen ratio in soil
organic colloid
organic fertilizer
organic horizon
organic matter
organic mineral complex
organic mineral soil
organic nitrogen
organic nitrogen pool
organic nutrition of plant
organic phosphorus
organic soil

osmotic potential
osmotic suction
osmotic water

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