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agriculture(35)
carbon(9)
population(6)
conservation(5)
landscape(5)
sustainability(5)
biomass(4)
fertilizers(4)
geochemistry(4)
cation exchange capacity(3)
drought(3)
forests(3)
grasslands(3)
organic carbon(3)
public health(3)
calcium(2)
density(2)
emissions(2)
environmental impacts(2)
irrigation(2)
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