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nitrate(17)
nitrogen(9)
isotopes(5)
carbon(4)
chlorophyll(4)
nitrogen oxides(4)
emissions(3)
nutrients(3)
agriculture(2)
atmospheric temperature(2)
nitrous oxide(2)
organic matter(2)
oxygen(2)
phosphate(2)
runoff(2)
turbulence(2)
absorption(1)
air quality(1)
atmospheric pressure(1)
carbon dioxide(1)
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