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agriculture(32)
conservation science(27)
forests(23)
agricultural soil science(19)
land use(16)
grasslands(14)
biodiversity(13)
ecosystems(9)
forest ecology(8)
agricultural economics(7)
agricultural land(7)
cereal crops(7)
climate change(7)
wetlands(7)
birds(6)
fisheries(6)
habitats(6)
agricultural irrigation(5)
erosion(5)
fertilizers(5)
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