《资治通鉴·汉纪·汉纪五》
刘章吟唱道： 深耕播种，株距要疏；不是同种，挥锄铲除！ 
章曰： 深耕穊种，立苗欲疏；非其种者，锄而去之！ 
Liu Zhang sang: Deeply till the soil and sow the seeds, the space between rows should be wide; if they are not of the same kind, swing the hoe and remove them!