四忌有违天时。在干旱气候条件下使用,施药浓度应降低。反之,雨水充足时使用,应适当加大浓度。施药时间应掌握在上午10时后至下午4时前,施药后4小时内遇雨要补施。五忌留种喷用。乙烯利、赤霉等调节剂用于棉花、小麦等留种作物,严重影响种子发芽率。因此,棉花、小麦等作物的种子田严禁使用乙烯、赤霉素等调节剂。 Four bogey against the sky. In arid climatic conditions, the application concentration should be reduced. Conversely, adequate use of rain should be appropriate to increase the concentration. Application time should be in the morning 10 o’clock to 4 o’clock in the afternoon, within 4 hours after application of rain to fill facilities. Five bogey stay spraying. Ethephon, Gibberellin and other regulators used in cotton, wheat and other crops, seriously affect the seed germination rate. Therefore, cotton, wheat and other crops in the seed field is strictly prohibited the use of ethylene, gibberellic acid and other regulators.