Bispyribac-sodium is a herbicide in rice field, which has special effects on barnyard grass and bromegrass (red mixed root grass and dragon cross), and can be used to control barnyard grass which is older and resistant to other herbicides. Other names: nongmeili, dipyrimidine salicylate. Structural English Common Name: bispyribac-sodium Sodium. Chemical name: sodium 2,6-bis (4,6-dimethoxypyrimidyl -2- oxy) benzoate. Molecular formula: C 19H 17N4NaO8. Si Nuo. : 12540 1-92-5. Structural formula: as shown in the right figure. Edit the physical and chemical properties of this paragraph. Bispyribac-sodium is a white powder with a melting point of 223~224℃, a vapor pressure of 5.05 * 10 (-9) Pa (25), a bulk density of 0.0737 (20℃), and a solubility of 73.3 g/l in water (25℃) and 26.3g/L in methanol. Edit the paragraph on animal toxicity. The technical toxicity of bispyribac-sodium sodium is low. Acute oral LD50>5000/kg and acute percutaneous LD50>2000/kg in rats. The acute oral LD50 of rats is 5840mg/kg for females and 4300mg/kg for males, and the acute percutaneous LD50 is more than 2000mg/kg. No irritation to skin, slightly irritating to eyes. Edit the environmental impact LC50 of rainbow trout and blue gill molars in this section >: 100ppm, Daphnia LC50 (48h) >:100ppm; Acute oral LD50 quail >: 2250mg/kg, and LC50(5d) quail and wild duck >: 5620mg/kg; Bee LD50 oral cavity >: 200 μ g/bee, LD50 >: 70000 mg/L. Edit 10%SC and 20% bispyribac-sodium sodium wettable powder commonly used in this paragraph. Direct seeding of upland rice, direct seeding of paddy fields and transplanting of rice seedlings edit this paragraph. Edit the control targets in this paragraph to effectively control gramineous weeds such as barnyard grass in rice fields, and treat most broadleaf weeds, some Cyperaceae weeds and barnyard grass resistant to other herbicides. Such as barnyard grass, paspalum bicuspidatum, rice, crabgrass, creeping bentgrass, buttercup grass, northeast sweet grass, cymbidium grass, Cyperus heterophylla, Cyperus japonicus, Cyperus fragrans, iris, Japanese grass, flat grass, Hedyotis diffusa, Euonymus japonicus, Alisma orientalis and Potamogeton. It has special effects on old barnyard grass and double-spike barnyard grass, and can kill barnyard grass at 1-7 leaf stage. Bispyribac-sodium is a benzoic acid herbicide and an efficient inhibitor of acetolactate synthase (ALS). After application, this product can be quickly absorbed by the stems and leaves of weeds and transmitted to the whole plant, inhibiting the growth of plant meristem, thus killing weeds. High efficiency, broad spectrum and very low dose. Usage of this paragraph: Direct seeding in paddy field: This product can be used from seedling emergence to heading of direct seeding rice, and the application effect is the best at the 3-5 leaf stage of barnyard grass. Use 20% bispyribac-sodium wettable powder 18-24g, add 25-30kg of water per mu of direct seeding paddy field, and spray weed stems and leaves evenly. Transplanting field or seedling-throwing field: In rice transplanting field or seedling-throwing field, the pesticide should be applied after transplanting or seedling-throwing 15 days, and the seedlings turn green, so as to avoid pesticide application too early and poor drug resistance of seedlings, resulting in phytotoxicity. Use 20% bispyribac-sodium wettable powder 12- 18g per mu, add 25-30kg of water, and spray weed stems and leaves evenly. Dry the field water before application to expose all weeds, irrigate for 1-2 days after application, and keep the water layer of 3-5cm for 4-5 days. Notes for editing this paragraph 1. This product can only be used for weeding in rice fields, not for other crops. 2. The leaves of japonica rice varieties turn yellow after spraying this product, which can be recovered in 4-5 days without affecting the yield. 3. Barnyard grass can be used at 1-7 leaf stage, with small barnyard grass, low dosage, large barnyard grass and high dosage. 4. When using this product, adding silicone accessories can improve the curative effect.