(I) Method of Using Chemical Herbicides in Rice Fields The common feature of chemical herbicides is the high lethality of weeds at high temperatures and weak on the contrary. Therefore, the application of herbicide in early rice field should be about 15 days after transplanting, and the middle rice and late rice should be carried out 4 to 6 days after transplanting. Application method: Select sunny dew dry, use 25% perchloric herbicide ether 500 ~ 600 grams, or 25% herbicide ether 300 grams plus 500 grams of sodium pentachlorophenol, or 50% herbicide cream 250 ~ 300 grams, with moist Fine soil 15 kg mix, stuffy stuffy for a long time, and then evenly spread into the rice fields. Do not drain the field for 1 week and keep the water depth 3 to 6 cm. This method has good effects on barnyardgrass and calfgrass, but it is not effective against weeds such as Trifolium pratense, Malus gracilis, and wild bogweed. Therefore, for these weeds, depending on the situation, 70% dimethyl tetrachlorin is used per acre for 75 to 100 grams, 40 kg for water, and sprayed on the second day after the paddy field water is drained. After spraying, water is sprayed every other day. After transplanting for half a month, some paddy fields are prone to grow vicious weeds such as chinensis (also called bamboo grass). When it grows 3 to 5 leaves, use 50% of prometryn 40-50 grams per acre, add 15 kg of moist fine soil, spread, keep 3 to 6 cm water depth of 7 days, the effect is good. Can also be used paraquat net 40 grams plus 70% dimethyl tetrachlorohydrin 100 grams, mixed wet soil 15 kg, applicator. This method can not only kill the eye grass, but also to kill the sunlight floating Buddha grass, festival grass, duck tongue grass, wild mushroom, wild seedlings and other weeds. (B) Remedies for chemical pesticide herbicide damage in rice fields 1. Herbicides Symptoms Seedlings are burned like fire, and some cannot be heading normally, and some cannot be strong. The reasons for the occurrence of drug injury are: excessive rice paddy area, resulting in uneven application volume, use of poisonous soil such as bamboo razor clams, and leakage of drugs while spraying; mixing medicine too dry, separation of medicine and soil; plowing or leakage of paddy fields, Intoxication caused by flooding of seedlings or chemicals increased; 2. Remedy measures for phytotoxicity (1) Seedlings of seedlings and seedlings, most of which are caused by excessive drug use, should be immediately released into the field medicine; rinse with fresh water. (2) Serious phytotoxicity: 50-100 kg of lime or ash per acre is applied, and 1% of bleaching powder is used for minor phytotoxicity. (3) After adopting the above measures, if the seedlings still can't grow, they can make up the planting; if they can't, they can add 5~7.5 kg of urea per acre.
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