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fertilizers(39)
surface water(39)
ecosystems(38)
seasons(34)
biogeochemistry(32)
nitrates(32)
agricultural soil science(31)
forests(31)
lakes(31)
sediment(31)
carbon dioxide(28)
climate change(27)
leaves(27)
sea water(26)
biomass (ecology)(23)
phytoplankton(23)
stable isotopes(23)
oxygen(22)
cereal crops(21)
grasslands(21)
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