Ma Bingyin, Shizhuang Town, Guanyun County, said on January 12th that in June 2010, he sprayed 56% of a 15 kilograms of amaranth on the 15 acres of weeds for 3 times. The dosage was not very clear, and the result was after the lockup in October. The growth of the first knife was inhibited, and the second knife was not long. Taking into account the large planting area, the loss of large-scale farming and replanting, he would like to conservation of the field of leeks for a period of time, until the second half of this year, the production of greenhouse shed leeks. He asked if it is feasible to do so, after the leek can not resume growth. 2A and 4C are phenoxyacetic acid selective hormone herbicides. Drugs are absorbed through the plant's roots, stems, and leaves. Symptoms of hormone-based herbicides appear after exposure to sensitive plants, manifesting as leaf curling and petiole and stem rotation. , bending, apical enlargement, leaves chlorotic yellow, stiff and brittle, eventually died of dry. This medicine is suitable for the control of crops such as rice and wheat in addition to Trifolium repens, Apatula, Alisma, Wild Sagittaria and other broadleaf weeds. According to a researcher from the Institute of Agricultural Sciences of Yunnan Academy of Agricultural Sciences, leeks and other crops are sensitive to 2A and 4C. The application of 2A and 4C chloride to leek can cause phytotoxicity, resulting in plant malformation or growth inhibition. The above-mentioned phenomena such as the suppression of the growth of leeks in the fields mentioned above are likely to be caused by the damage of 2-4-chlorophenol. 2 A 4 chlorine in the soil in the residue period is very long, the activity in the soil up to 3 to 4 months, so after a long period of time after the drug will be a 2 4 chlorine harm. According to Ma Bingyin, in June 2010, 2 A 4 chlorine was applied. Since October 2009, the leek still showed a phenomenon of inhibited growth. Heavier phytotoxicity, and whether it can be fully restored through conservation and management, remains to be seen. The crop is affected by 2 A 4 chlorine. Spraying an appropriate amount of gibberellic acid will help alleviate the symptoms of pesticide damage and promote crop recovery. For the above-mentioned damaged leeks, it can be considered to spray 10 to 20 mg/L of a low concentration of gibberellic acid solution to promote recovery. Usually about 1 week, spray once, stop spraying when the leek recovers. The application concentration should not be too large to prevent the plant from becoming tall, but it is not conducive to recovery. During the curing period, pay attention to the control of temperature and light, and the temperature should not be too low or too high. With the passage of time, the 2 A and 4 chlorine in the soil will gradually degrade and fail. If the Amaranth resumes its growth, it can later be used for greenhouse production.
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