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agricultural lands(154)
soils(89)
carbon(43)
nitrogen(30)
organic carbon(19)
oxygen(16)
drought(10)
droughts(10)
ammonia(8)
wetlands(7)
forests(6)
irrigation(6)
phosphorus(6)
sedimentation(6)
agriculture production(5)
conservation(5)
heavy metals(5)
isotopes(5)
metals(5)
trace elements(5)
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