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agriculture(169)
carbon(90)
conservation(55)
forests(54)
soils(52)
irrigation(51)
fertilizers(47)
population(45)
erosion(39)
nitrogen(39)
organic carbon(39)
vegetation(35)
surface water(34)
landscape(32)
biomass(31)
emissions(31)
grasslands(29)
density(27)
organic matter(26)
loess(24)
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