How does wheat apply herbicide to prevent frost harm?

How to prevent frost injury when applying herbicide to wheat? Is there any way to solve this? Under the condition of frequent cold wave and drought, improper application of herbicides in wheat fields is easy to cause freezing injury. In many areas, wheat fields have been using hypertonic isoproturon and benzene sulfonate. Isoproturon, Bensulfuron? Isoproturon, chlorsulfan? Isoproturon and other herbicides containing isoproturon. These herbicides are easy to cause freeze injury in cold wave. Frequent cold wave According to statistics, from November 20, 2008 to January 20, 2009, there were five cold waves during this period. Such frequent cold wave weather easily led to freezing injury in wheat fields using the above herbicides. The investigation found that the dosage of 50% isoproturon was increased to more than 230 g/mu in some fields, and some fields were mixed with fenoxapyr. When cold wave is frequent, it is inevitable that frost injury occurs in wheat fields with increased dosage. According to another investigation, insufficient water addition and excessive concentration of liquid medicine are also one of the reasons for freezing injury. Drought in winter 2008 is also an important cause of freezing injury. According to investigation, all soil moisture small, dry white wheat field frost injury occurs seriously. In the same field, the frost injury occurred lightly in wet place, the upper part of wheat seedlings did not freeze to death, but all the upper parts of wheat seedlings froze to death in dry and white soil. The results showed that high humidity in field could protect wheat seedlings from cold injury. Extensive tillage and tillage are more extensive, no-tillage wheat fields, wheat seedlings take root shallow, tillering nodes do not have soil protection, freezing injury occurs seriously. The cold-resistance of wheat with big and weak seedlings was stronger than that of wheat with small seedling age, and vice versa. Frost injury of strong seedlings was lighter than that of weak and diseased seedlings. Frost damage of soil factor mostly occurs in sandy soil, but not in clay soil. Preventive measures First of all, according to weather forecast to determine the appropriate period of medication. The weather forecast is now more accurate, especially the application of satellite cloud pictures, which can accurately predict the weather conditions in the next week. You can avoid bad weather by paying attention to the weather forecast. Secondly, strictly control the dosage of isoproturon, do not increase the dosage at will, and use enough water. Thirdly, pay attention to the soil moisture when using medicine, in order to prevent the occurrence of freezing injury. Do not use the drug in the case of soil drought. Soil drought also affects the efficacy of isoproturon. If the wheat field is dry, you can apply water and moisture before applying medicine. Remedial measures occurred in frozen wheat fields, should be based on specific circumstances to take appropriate measures to remedy. The field with 70%~80% survival rate of tiller node should strengthen fertilizer and water management to promote the recovery of wheat seedling growth. Tillering node survival rate of 30%~40% of the field, especially extensive soil preparation and sandy land of wheat, tillering node exposed to the soil surface, wheat seedlings can not resume growth can be considered to plant other crops. Click to get mass herbicide application technology Click to get mass pesticide application technology Click to get mass wheat planting technology