Soil organic carbon data in Northeast China

135 soil samples were obtained from cropland in Suihua city in 2021, ensuring that each soil sample was located away from roads and distributed at 5–10 km intervals. The detailed procedures for processing methods of soil samples in the field and laboratory . SOC ranged widely from 8.66 to 35.21 g kg-1, with a total variation of 26.55 g kg-1.