(1) Method for chemical herbicides in rice fields
The common feature of chemical herbicides is that the weeds are strong when the temperature is high, and vice versa. Therefore, the application of herbicides in early rice fields should be about 15 days after transplanting, and medium and late rice should be carried out 4 to 6 days after transplanting. Application method: After selecting dry dew on sunny days, use 25% herbicide ether 500-600 g per acre, or 25% herbicide ether 300 g plus 500 mg of pentachlorophenol sodium, or 50% chlorpyrifos EC 250-300 g. Mix 15 kg of fine soil, mix for a long time, then spread evenly into the rice fields. Do not drain the field within 1 week, keep the water depth 3 to 6 cm. This method has good effects on alfalfa and cattle grass, but it is not effective against weeds such as striata, ragweed and wild sage. Therefore, for these weeds, depending on the situation, 70 to 100 grams of dimethyltetrachloride can be used per acre, and 40 kilograms of water can be sprayed on the second day after the paddy water is drained.
After half a month of transplanting, some rice fields are prone to grow malignant weeds such as eye-leaf vegetables (also known as bamboo grass). When it grows 3 to 5 leaves, 40 to 50 grams of 50% of the grass is used per acre, and 15 kg of moist fine soil is added. The application is carried out, and the water depth of 3 to 6 cm is maintained for 7 days. The effect is good. It is also possible to use 40 grams of chlorpyrifos and 100 grams of 70% dimethyltetrachloride. Mix 15 kg of moist fine soil and apply it. This method can not only kill the eye grass, but also kill the weeds such as the sun shining Buddha grass, the grass, the ragweed, the wild mushroom, the wild seedling.
(2) Remedy for chemical damage of rice field chemical herbicides
1, herbicide phytotoxicity symptoms seedlings like fire burned, some can not normally head, some can not be strong. The causes of phytotoxicity are: the area of ​​the paddy field is too large, resulting in uneven application, using scorpion and other toxic soil, while spilling the medicine; the medicine is too dry, the soil is separated; the paddy field is uneven or leaking, The concentration of the drug-infested seedlings or the drug is increased; too early in the field.
2, remedies for remedies (1) seedlings dry seedlings, mostly caused by excessive drug use, should immediately release the field syrup; pour into the water to rinse. (2) Severe phytotoxicity is applied per hectare with 50-100 kg of quicklime or ash, and 1% of bleached powder is sprayed with a slight remedy. (3) After adopting the above measures, if the seedlings are still unable to resume growth, they can be replanted; if they are not replanted, urea can be added 5 to 7.5 kg per mu.
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