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fertilizers(5)
cereal crops(2)
climate change(2)
ecosystems(2)
maize(2)
wheat(2)
agricultural soil science(1)
biomass (ecology)(1)
carbon dioxide(1)
carbon storage(1)
cropland expansion(1)
forests(1)
grasslands(1)
land management(1)
land use(1)
latitude(1)
leaves(1)
nitrification(1)
oat(1)
physical geography(1)
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