The result that the date of one cutting must be earlier than later heading stage, and the first date of two cuttings cannot be later than jointing stage.

• 结果表明，一次利用时，刈割时间不能超过抽穗后期。两次利用时，头茬刈割时间不能超过拔节期，二茬应在抽穗后期刈割。