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fertilizers(22)
carbon(21)
nitrogen(21)
irrigation(19)
biomass(12)
conservation(11)
agriculture(9)
carbon dioxide(9)
surface water(8)
loess(7)
population(7)
vegetation(7)
evapotranspiration(6)
organic carbon(6)
organic matter(6)
precipitation(6)
soils(6)
cropping systems(5)
density(5)
emissions(5)
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