Use herbicides in the rainy season to prevent phytotoxicity

  The use of chemical herbicides for weeding has the outstanding advantages of labor saving, labor saving, time saving and good effect, and is more and more popular among farmers. However, herbicides are double-edged swords. While promoting crop yields, if they are not used properly, they will not increase production, but will result in reduced production. The rainy season is the period of weeds, and it is also the season with the most herbicides and the high incidence of phytotoxicity. The following measures can be taken to avoid the occurrence of phytotoxicity:

  To choose the right variety. Each herbicide has a strict range of use, and different crops require different varieties of herbicides, even if the same crop requires different herbicides in different growth stages and different squats. For example, butachlor and acetochlor, although only one word difference, the former applies to paddy fields and the latter applies to dry fields. Therefore, when purchasing the medicine, you must choose the label to indicate the object that needs to be controlled, and the method of use is suitable for you. When several varieties are available for selection, it is necessary to use a variety of products with good efficacy, low toxicity, low residue and good safety. It is necessary to use new varieties with caution, and for new varieties that have not been used, you can conduct a small-area test first, or understand the results of the surrounding users before deciding whether to use them or not.

  Strictly according to the dosage and method specified in the manual, the dosage should not be increased or decreased at will, and it should not be sprayed or leaked. The author has seen many farmers "hate the grass and not die" and increase the amount at will. There are also some pesticide distributors who use the means of improving the control effect to pull back the customers to achieve the purpose of multi-sales, and recommend high-concentration herbicides to farmers. It is not uncommon to increase the concentration and dosage at will, causing phytotoxicity. For example, if the cotton field uses the pre-emergence herbicide acetochlor, the prescribed amount per acre is 100-150 grams, and many people increase the dosage per acre to 200-250 grams, and the phytotoxicity causes the cotton deficiency to reach 2~3. to make.

    Strictly prevent drifting hazardous non-target crops. 2,4-D butyl ester was used in the spring wheat field , and the damage to other dicotyledonous plants was most prominent. The damaged cotton showed that the leaves were scorched, curled, deformed, withered, the plants were dwarfed, the buds and bells fell off, the cotton buds became smaller and deformed, and the yield was generally reduced by about 30 %, and the weight loss was as high as 50% or more. Dicotyledonous plants such as cotton, peanuts, vegetables, and tobacco are very sensitive to 2,4-D butyl ester. Wheat should be avoided in areas where wheat is mixed with the above crops. In order to prevent the drift of herbicides, spray in the windless or breeze weather, the direction of the nozzle should be consistent with the wind direction, the direction should be perpendicular to the wind direction or the angle should be no less than 45 degrees, first spray the wind, then spray the wind, strictly prevent The liquid spray drifts with the wind to harm sensitive crops.

    Take care to prevent damage to the squat (season) crop. Some herbicides have a long residual period and can cause squat (season) crop damage. Therefore, when selecting a herbicide, it is important to consider what crops are to be planted in the next season. Atrazine is suitable for weeding before corn buds, but if crops such as sugar beets, potatoes, melons, vegetables, etc. are planted, the corn field cannot be used, otherwise it will cause phytotoxicity in the sorghum crops.

  Sprayers that spray herbicides must be thoroughly cleaned, cleaned, and then used with other pesticides to prevent herbicide damage. (Zhangle County Agricultural Bureau, Shandong Province)   Jia Dengsan)

 

 

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