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nitrate(35)
nitrogen(32)
oxygen(14)
surface water(14)
carbon(13)
biomass(12)
salinity(11)
sediments(10)
chlorophyll(8)
lakes(8)
nitrite(8)
nutrients(8)
oceans(7)
water quality(7)
nitrous oxide(6)
carbon dioxide(5)
estuaries(5)
fertilizers(5)
soils(5)
wetlands(5)
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