Zhao Jianbiao, Gonghe Town, Hongze County, came to the telephone and said that there is a large area of ​​dry direct seeded rice after sowing this year. There is no cover seed, and 400 ml of 50% butachlor is used for soil closure treatment per acre. It is understood that there was no phytotoxicity in this way last year. He asked if this would cause phytotoxicity.

Butachlor is an amide selective pre-emergence herbicide that can be used in paddy fields and drylands to control the germination of grassy weeds, annual sedges and some annual broad-leaved weeds. It has good control effect against weeds such as valerian, thousand-gold, sedge sedges, broken sedges, and cattle blankets, and it also has better control effect on the genus Apatula, articulate grass, cusp flower, firefly, and so on. Trifoliate, stalked grass, wild arrowhead and other perennial weeds have no obvious control effect. After application, only a small amount of butachlor can be absorbed by rice seedlings and rapidly catabolize rapidly in vivo, thus rice seedlings have strong resistance to drug resistance. However, if the dosage is too large, it will cause phytotoxicity to the rice seedlings, resulting in symptoms such as growth inhibition, root swelling, and severe death. The use of butachlor in transplanted rice fields and direct-seeded rice fields can not exceed 90 grams per mu of pure drug, otherwise it will cause phytotoxicity to rice seedlings.

According to Zhao Jianbiao, 400ml of 50% butachlor is used per acre, equivalent to 200 grams of pure medicine per acre, and the dosage is too high, which can easily cause injury to direct-seeded rice. There is no phytotoxicity after treatment, and it is likely that the soil is dry and the efficacy cannot be fully exerted. If heavy rain occurs after medication, serious injury may easily occur. At present, the province has entered the Meiyu period, the rainfall will increase, blindly increase the amount of butachlor, may cause serious injury. For direct application of butachlor in paddy field, the dosage should be strictly controlled so as to avoid phytotoxicity.

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