《吕氏春秋·纪·孟春纪》
国君宣布农功之事，命令农官住在东郊，监督农民整治耕地的疆界，审视并端正田间的小路；很好地考察丘陵、山地、平原，洼地等各种地形，什么土地适宜种什么备物，什么谷物应在什么地方种植，要用这些教诲引导农民，而且务必亲自去做。
王布农事，命田舍东郊，皆修封疆，审端径术。善相丘陵阪险原隰，土地所宜，五谷所殖，以教道民，以躬亲之。
The ruler shall announce the plan for the farm work, and order the agricultural officials to live in the eastern suburbs to supervise the farmers in fixing field boundaries, examine and straighten the paths through the fields, to investigate the quality of the various terrains such as hills, mountains, plains, and lowlands, to inform the farmers about which lands are suitable for particular plants and grains, and which crops should be grown in which locations, and to make sure that these guidelines are followed.