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nitrogen(32)
nitrate(21)
oxygen(10)
sediments(6)
surface water(6)
carbon(5)
biomass(4)
phosphorus(4)
wetlands(4)
ammonia(3)
fertilizers(3)
lakes(3)
nitrite(3)
nitrous oxide(3)
nutrients(3)
phosphate(3)
soils(3)
water quality(3)
aquaculture(2)
chlorophyll(2)
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