《农桑辑要·播种·水稻》
稻苗七八寸高时，原来已被消灭的杂草，会再次生长起来，只要用镰刀在水面以下将它刈倒，草便全部被泡烂死掉。
稻苗长七八寸，陈草复起，以镰侵水芟之，草悉脓死。
When the rice seedlings are seven or eight inches high, the weeds that had been eliminated before will grow again, so just use a sickle to cut them down below the water surface, and the weeds will be completely soaked and die.