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cation exchange capacity(11)
carbon(5)
ph(5)
nitrogen(4)
organic carbon(3)
precipitation(3)
biomass(2)
calcium(2)
density(2)
fertilizers(2)
ions(2)
iron(2)
oxygen(2)
soil chemistry(2)
soils(2)
beaches(1)
degradation(1)
earthquakes(1)
forests(1)
heavy metals(1)
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