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agricultural soil science(193)
soil conservation.(56)
soil science & conservation.(55)
soil science(49)
cereal crops(45)
land use(45)
agriculture(41)
environment.(37)
fertilizers(37)
erosion(36)
soil ecology(33)
maize(32)
china(28)
forests(28)
environmental sciences.(27)
wheat(26)
environmental science(25)
soil chemistry(23)
loess(22)
geography.(21)
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