Black soil belt of northeast China

Soil samples were collected from 29 cropland locations covering three provinces in Northeast China (Heilongjiang, Jilin, and Liaoning province) during harvest season in October 2020.2020年10月收获季，从中国东北三省（黑龙江省、吉林省、辽宁省）的29个农田采样点位采集了土壤样本。