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agricultural soil science(193)
soil ecology(81)
forests(52)
land use(47)
cereal crops(46)
soil chemistry(46)
erosion(42)
fertilizers(41)
carbon dioxide(35)
ecosystems(35)
china(34)
seasons(34)
soil respiration(34)
maize(33)
grasslands(27)
loess(26)
wheat(26)
forest ecology(24)
rain(24)
sediment(24)
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