There are many types of weeds occurring in the seedling stage of rice fields, and the damages are heavy. The main weed species are valerian, chinensis, sedge, and other broad-leaved weeds. If they are not controlled in time, the grass seedlings can be easily formed in direct-seeded rice fields, and they can compete with the seedlings. To win light, affect the quality of seedlings, the general reduction of 2-3%, while the weight is reduced by more than 50%, serious field and even the formation of grassland. To this end, all street offices and towns must carry out the chemical weeding work in rice fields in a timely manner, and in particular control the damage of weeds in direct broadcast rice fields. Specific chemical weeding methods are as follows:
1. Live rice fields:
(1) Pre-emergence soil treatment after sowing. Germination sowing of water directly on the rice fields, after 3-4 days after falling valley, with 30% Saporite per acre 100-120 ml of water evenly sprayed 30 kg, after the drug to maintain the wet surface moist for 3-4 days, but avoid product Water to prevent accumulation (flooding) of water causing phytotoxicity. Note: The rice field selected with Suffolt must be used after germination; the dry rice field is sown, the soil is sowed after covering the soil, and after the field is dried naturally, the water is evenly sprayed with 42% diammonium EC 120ml per mu. After the drug is kept moist, water should not be allowed in the field. Note: The field should be leveled and the ditch should be matched; the rice should be covered with soil after sowing, and deseeding the seed field will harm the rice shoots and affect the emergence.
(2) Post-emergence shoot and leaf treatment. In the 1.5-3 leaf stage of alfalfa, 60 ml of 2.5% Penoxsulam Sulfonate oil suspension (Ojachi) was used per acre to evenly spray weed stems and leaves on the water. Before spraying, field water should be drained, and the shallow water layer should be reconstituted 1-2 days after application, and water should be kept for 3-5 days. For old age (3-4 leaves), Qianjin and Echinochloa crusgalli should be controlled and used after drainage. 10% Cyhalofop-ester EC (in daughter's milk) 60-80 ml, spraying weed stems and leaves on water, putting water on the next day, and keeping water for 3-5 days. Note: Indicia herbicides such as Indigenous can not be mixed with organophosphorus pesticides, and avoid liquid drift during application to prevent phytotoxicity.
2. Large seedlings transplanted into paddy fields: 14% of straw used per acre 40 grams, 6-7 days after transplanting (after rice awakened), the upper water layer 3-5 cm, 20 kg per acre mixed fine soil withdraw , And water 4-5 days, naturally dry. Note: Strawweed, etc., are sensitive to oyster mushrooms and quail. Liquid medicine should not be discharged into aquatic vegetable fields.
3. Transplanting seedlings and throwing seedlings into the field: Use 40% to 50 grams of phenanthroline benzyl per acre (40-50 grams), or 30% of butyl benzyl 100-125 grams per acre (6-7 days after machine transplanting or seedling dumpling) (live rice plant After), after the shallow water layer, mix 20 kg of fine soil and apply it, and keep the water for 4-5 days, naturally dry. Matters needing attention: the entire field surface, dew area or water leakage field is poor; water retention after drug is the key to improve the control effect, but must not submerge the rice leaf.
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