"Lodging" is one of the main obstacles affecting wheat yield under high fertilizer and water conditions. In recent years, the popularization and application of plant growth regulators in wheat production has opened up a new way to prevent lodging and promote yield increase, and is an important supporting technical measure for high and stable yield of wheat.

1. Spraying paclobutrazol at the starting stage of wheat, spraying 30kg of 200ppm paclobutrazol solution per mu can make the plant dwarf, enhance the ability of lodging resistance, and can also control wheat powdery mildew and improve the plant's nitrogen absorption and utilization rate.

2. The application of Uniconazole Uniconazole (code S-3307, commercial 5% wettable powder) is a new and efficient plant growth regulator, its biological activity is 6-10 times higher than that of paclobutrazol. Applying it on wheat can prevent plant lodging under high density, high fertilizer and water conditions, and can reduce sterile spikelets and increase 1000-grain weight; According to the test, the wheat with uniconazole increased by 15.4% on average compared with the control under the condition of no wind and no lodging. Application method: within one week before wheat jointing, spray 50 kg of 30-40 ppm uniconazole solution per mu.

3. For the wheat field with large population and vigorous growth, spraying 0.15 ～ 0.3% chlormequat solution 50 ～ 75 kg per mu at the early stage of jointing can effectively inhibit the elongation of internodes, make the plant dwarf and the stem base rough and hard, thus preventing lodging; If mixed with 2,4-D butyl ester, it can also control broadleaf weeds in wheat field.

4. At the jointing stage of wheat, the application of chloroquine 15~20 ml per mu and 50~60 kg of water on the leaf surface can inhibit the elongation of internodes, prevent late lodging, and increase yield by 10~20%.