小麦喷施多效唑,可以抑制节间生长,降低株高,增强植株的抗倒能力,同时还能增加穗粒数,提高千粒重,增加产量。但如果使用不当,则会产生副作用,甚至减产。因此,在使用多效唑时应注意以下几个问题:(1)严格控制用量。试验表明,在不同栽培条件下喷施多效唑,均可降低小麦株高,且用量越大降低越明显.当每亩用量超过60克时,植株严重矮化,抽穗晚2—3 Wheat sprayed paclobutrazol can inhibit internode growth, reduce plant height and enhance the ability of lodging resistance, but also increase grains per spike, increase 1000-grain weight and increase yield. However, if used improperly, it will have side effects, or even cut. Therefore, the use of paclobutrazol should pay attention to the following questions: (1) strict control of dosage. The results showed that applying paclobutrazol under different cultivation conditions could reduce the plant height of the wheat and the more significant the decrease was, the more severe the plant was when the amount was over 60 g / dm2, and the plants were severely dwarfed 2-3 days after heading