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agricultural soil science(193)
agriculture(93)
land use(66)
cereal crops(58)
forests(52)
agricultural irrigation(44)
fertilizers(43)
maize(42)
china(37)
climate change(36)
erosion(36)
surface water(33)
wheat(32)
seasons(31)
soil ecology(30)
grasslands(28)
conservation science(27)
ecosystems(24)
biodiversity(23)
rain(23)
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