Before the three-leaf stage of wheat, the resistance of wheat seedlings was very poor. The treatment at this stage could easily cause wheat phytotoxicity. The lighter leaves were distorted and affected the yield. Generally, wheat seedlings grow to more than 4 leaves and weeds are almost uniform. This is the best time for weeding in wheat fields. Farmers should pay attention to the weather forecast in advance and choose continuous sunny days. Generally, there will be no frost and heavy rain in 4 days. The temperature on that day is higher than 8 ° C. It is advisable to carry out from 10 am to 4 pm. In addition, farmers are better to take advantage of the opportunity after the rainfall to apply medicine. Fields with severe drought should be irrigated and drained before spraying.
It should be noted that the effect of the herbicide is significantly slower in the low temperature in winter than in the high temperature in summer and autumn. Therefore, you must wait patiently after the application in winter. As long as the timing is good and the liquid is sprayed in place, you do not need to re-administer the drug.
When using herbicides, strictly follow the technical operating procedures to avoid various types of phytotoxicity.
The first is to improve the quality of medication and avoid damage to wheat seedlings. When spraying herbicides in winter, water should be added strictly according to the dilution factor. Do not reduce the amount of water at will. When spraying, pay attention to thoughtful, uniform, non-re-spraying and leak-proof spraying. The amount of herbicide per acre is small. It is best to first use water to form a mother liquor and then pour it into a sprayer filled with water, that is, to dilute it twice.
The second is to prevent herbicides from drifting. Because the winter temperature is low and often accompanied by strong winds, it should be applied during the periods of no wind or breeze where the temperature is relatively high on sunny days to ensure the efficacy and avoid the harm. According to experience, after December, weeds in wheat fields, especially isopropylon herbicides, are not effective in controlling weeds. Weeds have a strong physiological metabolism when the temperature is high on sunny days, which is beneficial to the weeds in the body Conduction, easy to receive better weeding effect.
In addition, it is best to use a special sprayer for spraying herbicides. Be careful not to contaminate the water source before and after spraying.
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