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1. Thick wheat straw in the field: Nowadays, wheat fields are harvested by large harvesters. The height of wheat stubble is generally 25 to 30 cm. Most of the wheat straw and wheat bran are scattered into the field, and the surface is completely covered by wheat bran and wheat straw. In the corn management, the farmers do not kill the cockroaches, nor pull the stalks out, directly spray the herbicides, the medicinal liquid rarely falls on the soil surface and weeds, and can not close the ground and kill the weeds. . Especially for the large weeds left in the wheat field, the corn herbicide has very little lethality to it.
2. Environmental factors. The application of summer corn herbicides is mostly in mid-June, at this time, high temperature, drought, less rain, and abnormal climate change. After spraying the herbicide, the liquid evaporates and is fast, it is difficult to form a closed film on the surface of the soil; and the high temperature and drought hinder the drug effect in the weed body to transport and conduct; sometimes the herbicide sprays suddenly rain, causing the liquid to accompany the rain Loss, no effect.
3. The amount of liquid is small. Some farmers in order to save labor and time, when configuring liquid, but not enough dosage sufficient amount of water added, only about 15 kg per mu in general, cause the entire liquid is small, do not form a membrane in the ground after spraying, less than expected Control effect.
4. The application period is late. The current corn herbicides used in weed leaf stage before spraying control is better, the best weed control effect of three-leaf stage, however, some farmers spraying is not timely, time and late, after the weeds grow up, resistance enhanced, missed the best time for prevention.
5. The method of application is incorrect. (1) The suspending agent herbicide is used without being sufficiently shaken. (2) Using the forward-type spraying method, the ground that has just been closed with the liquid medicine is stepped on by the foot of the foot, and the foot part continues to grow grass. The inverted spray method should be used, (3) the spray is not uniform, and there is a phenomenon of leakage spray and heavy spray. (4) The spraying time is wrong. Spraying around noon, the liquid evaporates quickly, which reduces the efficacy. (5) The nozzle is too high from the ground, especially in the windy days. Some pesticides fall outside the corn field, and the effective dose is reduced, which affects the effect of weeding.
6. Choose a herbicide improperly. Most farmers do not know enough about the chemical composition of herbicides and the types of weeds. They cannot choose the right medicine for the type of weeds. At present, there are many closed herbicides on the market, such as jade no grass, jade, jade, cyanazine, grass, agricultural, jade, etc., generally 250 grams per mu, 30 kg of water, for general Weeds are very effective. However, for intractable weeds such as fragrant aconite, Tianxuanhua, etc., we should use danshatong, Yushaling, Xiangfuqing and other medicines. For every 40 grams of water, 15 kilograms of water, the key spray, must spray weeds.
Huaxian County Shang Hongyan
Why is the herbicide's herbicidal effect poor?
In the production, farmers often report that the weeding effect of herbicides is not good, and disputes with dealers. The reasons for the analysis are mainly as follows.
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