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Rothamsted carbon model RothC-26.3 was used to monitor SOC changes in 7 on-going Russian long-term fertilization experiments having been maintained for more than two decades with high quality monitoring of vegetation and soils and potential for access to data. The experiments were launched in 1931-80 in podzol, albeluvisols and chernozem. Crop rotations with control, fertilized, manured, fertilized and manured treatments were compared. The model gave an acceptable approximation to the measurements for the most of the treatments tested.