How to plant rice by chemical weeding in the field

1. Chemical removal of seedling fields

1. Fertilizer bed, dry nursery bed. Fertilizer bed dry seedling bed has many weeds and great harm, so it is necessary to grasp the appropriate time for prevention and cure. 42% Xinye EC spray is fully used and the film is covered after spraying for half an hour. For the leakage treatment field, you can pour enough water after the seedling three-leaf stage, and then spray 50 kg of water with 36% rice straw net 45 grams.

2. Conventional rice seedling field. Conventional rice seedling raising fields, such as mixed weeds, can be controlled by the following methods: ⑴ is mastered within 4 days after sowing (be sure to sprout), 30% Saufert is used to spray the water, and the seedling board is kept moist after spraying; ⑵ is mastered in the seedling 2.5 leaf stage, after draining the field surface water, 36% rice straw net is sprayed after water, water is rehydrated 24 hours after spraying, and the water layer of 3-5 cm is maintained for 5-7 days. If the seedling field is mainly composed of single sedge and broad-leaved weeds, the seedling field water can be drained after the seedling 4-leaf stage, 60 kg of water is sprayed with 250 ml of 13% dimethyltetrachloride per mu, water is rehydrated 3-5 cm after 36 hours, and water retention is 3-5 days.

2. Chemical weeding in the field

The main results are as follows: 1. conventional transplanting rice field. Transplanting rice fields mixed with paspalum grass, special-shaped sedge, dwarf mushroom, etc., with 20% Youcaojing 35 grams plus 10% benzenesulfuron per mu, or 200% Wanjiahuan 40-45 grams (1.5 bags) plus 10% benzenesulfuron 10 grams per mu. Transplant field mainly with special-shaped sedge, wild water chestnut and dwarf mushroom, with 20-30 grams of 10% benzenesulfuron per mu. Barnyardgrass is the main transplant field, with 20% excellent grass net 35 grams per mu. The above formulations are mixed with 20 kg of moist fine soil per mu, which should be applied within 4-6 days of transplanting live trees, and 1 inch of water layer for 5 days after transplanting.

2. Seedling throwing field and seedling transplanting field. Fields mixed with barnyardgrass, sedge and broad-leaved grass can use 53% seedling throwing star 30-40 grams, or 50% barnyardgrass 40-60 grams. The fields dominated by broad-leaved grass were treated with 15 grams of 10% bensulfuron-methyl wettable powder per mu, which were mixed with 20 kg of wet fine soil per mu 4-6 days after throwing (inserting), and sprinkled with water after the dew dried. Note that it must be carried out after the seedling is alive, and keep the 3-5 cm water layer for 4-5 days after using the medicine. the water layer should not flood the heart leaves, and Acetochlor and its compound should be banned in the seedling field.

3. Direct seeding rice field with water. Sweep 120 ml of fort with 30% per mu or 50 grams of straw with 36% net per mu. Application method: Saufert and direct seeding were sprayed with 50 kg water per mu within 2-4 days after rice sowing, and the field was kept moist after treatment. The rice fields with the above chemicals must soak the seeds to promote germination. The rice straw net is controlled in the seedling 2 leaves 1 heart stage to drain the seedling field water, according to 50 kg per mu of water fine spray, rehydration and water retention for 5 days after 36 hours.

4. Wheat and rice field. The control strategy of "one letter, two killing and three supplements" was adopted to control weeds in wheat and rice fields. " One letter, that is, on the 2nd-4th day after interplanting rice, 42% of 120ml of Xinye was mixed with 25 kg of poisonous soil per mu, and the wheat plant was evenly sprinkled when the soil was moist, and then the rope was used to push the wheat plant back and forth; the "second killing" means that the water was drained after wheat harvesting and seedling refinement. Yuguojin, a special herbicide used in wheat interplanting rice field per mu, was sprayed with water, rehydrated 36 hours after application and retained water for 5 days. The "three supplements" are controlled at the end of the tillering stage of rice, and herbicides such as gold and dimethyltetrachloride are selected according to the types of weeds in the field.