《后汉书·列传·刘赵淳于江刘周赵列传》
又郡国因牛疫，水旱、垦田多减，所以诏书命令分区种植，增进顷亩，为的是老百姓。
又郡国以牛疫、水旱，垦田多减，故诏敕区种，增进顷亩，以为民也。
In addition, due to cattle plague, drought, and flood, the cultivated land in the counties has been greatly reduced, so the imperial edict ordered the分区种植 to increase the number of acres for the people.