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agricultural soil science(193)
cereal crops(45)
land use(44)
agriculture(41)
fertilizers(37)
erosion(36)
maize(32)
soil ecology(30)
china(28)
forests(28)
wheat(26)
loess(22)
soil chemistry(21)
agricultural irrigation(20)
sediment(20)
seasons(19)
carbon sequestration(17)
rice(17)
surface water(17)
agriculture.(16)
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