《周礼·夏官司马·大司马》
凡征兵，依据土地的好坏和人口的多少来制定服役人数的标准。上等土地每年可耕种的占三分之二，休耕三分之一，耕种上等土地的农民可用以服役的每家三人；中等土地每年可耕种的占一半，休耕一半，耕种中等土地的农民可用以服役的每二家五人；下等土地每年可耕种的占三分之一，休耕三分之二，耕种下等土地的农民可用以服役的每家二人。
凡令赋，以地舆民制之：上地，食者三之二，其民可用者家三人；中地，食者半，其民可用者二家五人；下地，食者三之一，其民可用者家二人。
Whenever recruiting soldiers, standards would be set based on the quality of the land and the size of the population to determine the number of people required to serve. Each household that farmed superior-grade land, of which two-thirds could be cultivated each year and one-third lay fallow, would provide three men for service; each pair of households that farmed medium-grade land, of which half could be cultivated each year and half lay fallow, would provide five men for service; each household that farmed inferior-grade land, of which one-third could be cultivated each year and two-thirds lay fallow, would provide two men for service.