In 2008-2009, there was a large area of ​​frozen phytotoxicity in wheat fields in Gaoyou City. After investigation and analysis, under the condition of frequent cold wave and drought combination, improper use of herbicides in wheat fields is prone to frost damage.
cause
Reasons for Drug Selection In many areas, wheat fields have been used with herbicides such as hypertonic isoproturon, benzisomesulfuron, benzamisone, closupranolone and other drugs containing isoproturon. After application of these herbicides, it is prone to frost damage when they encounter cold tides.
Frequent cold wave According to statistics, during the period from November 20, 2008 to January 20, 2009, there have been five cold waves. As a result of such frequent cold wave weather, it is easy to cause frost damage in wheat fields using these herbicides.
The large amount of drug used and the high concentration of drug solution in townships (towns) such as Dismantle, Hanliu, Gaoyou, Longjing, etc. found that any fields with serious frost damage increased the dosage, and some fields had 50% isoproturon. The amount of mu was increased to 230 grams or more, and some were mixed with fenoxazole. When the cold wave is frequent, it is unavoidable to use frozen crops in the increased wheat fields. According to another survey, the lack of added water and the excessive concentration of liquid medicine is also one of the causes of frozen phytotoxicity.
Drought The winter drought in 2008 was also an important cause of frozen phytotoxicity. According to the survey, all the crops that have low soil moisture and dry white wheat have suffered severe frost damage. In the same field, the chilling injury occurred in the damp areas, and the wheat seedlings did not freeze to death in the ground, while the soil in the dried white areas was frozen to death. Description of the large humidity in the field of wheat seedlings have cold insulation effect, can prevent the occurrence of frost damage.
Extensive tillage and extensive tillage, no-tillage cultivation of wheat fields, wheat seedlings take root shallow, there is no soil protection for the tillering festival, frost damage seriously.
Seedlings and young plants with weak seedlings have relatively weaker cold resistance, whereas they are weaker. Strong seedlings suffered from chilling injury, and weak seedlings and diseased seedlings suffered relatively heavy damage.
Soil freezing and phytotoxicity mostly occurs in sandy land, and clay land does not occur.
Precaution
First, determine the appropriate period of medication based on the weather forecast. The current weather forecast has been relatively accurate, especially the application of satellite cloud maps, which can accurately predict the weather conditions in the next week. Just pay attention to the weather forecast to avoid bad weather medication.
Second, strictly control the amount of isoproturon, do not arbitrarily increase the amount of medication, and use a sufficient amount of water.
Again, pay attention to the appropriate soil moisture when using drugs to prevent frost damage. Do not use the drug when the soil is dry. Soil drought also has an effect on the efficacy of isoproturon. If the wheat field is dry, you can apply moisturizer and then medication.
Remedy
Wheat fields that suffer from frozen phytotoxicity should take appropriate measures to remedy the situation. In the field where the survival rate of the tiller is 70% to 80%, fertilizer and water management should be strengthened to promote the recovery of the wheat seedlings. For the tillers with 30% to 40% of the survival rate of the tillers, especially the wheat with extensive land preparation and sandy land, the tillering section is exposed on the surface of the soil. If the wheat can not grow, you can consider changing other crops.
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