The three components of bispyribofum, penoxsulam and oxazolamide are all herbicide -selective herbicides . The bispyribyl ether is a pyrimidine salicylic acid herbicide, the penoxsulam is a triazolopyrimidine sulfonamide herbicide, and the oxazolamide is an aryloxyphenoxypropionate herbicide. Each of the three ingredients has its own merits. It can't be said who is good or who is not good. It analyzes from 8 aspects for selection and reference. Control object The three components are all selective post-selective herbicides for rice seedlings. Penoxsulam is mainly effective against young sorghum, but it is not effective against resistant valerian (such as barley, red root mites, etc.). The bispyribyl ether is effective against the older sedge, the double-spotted garfish (red mixed root), the rice sorghum (grass), and has certain control effects on some broad-leaved grasses (spicy oysters, ragweed, water peanuts). The antagonistic barley has a general effect. Oxazolamide is effective against valerian, crabgrass, and tendon, especially for resistant sorghum. Both bis-oxalyl and penoxsulam are ineffective against gold, but oxazolamide has certain effects on the gold. Safety performance The bispyribyl ether is safer for indica rice, but sensitive to indica and japonica rice. Some varieties of rice will have slight or severe chlorosis and whitish phenomenon, but usually recover in about 7 to 10 days, which has no effect on the final yield of rice. The application time of bispyribyl ether is strictly required. It is required to use rice in the indica rice after the three leaves and one heart. The indica rice is used after the four leaves and one heart, and the rice is prohibited from being used at the booting stage. Penoxsulam is very safe for rice. Any rice variety is sprayed at the 2~3 leaf stage (live), and the results have no significant effect on rice height, heading stage and yield. When used in ultra-high doses, it has a certain inhibitory effect on the growth of rice roots in the early stage, but it recovers quickly and does not affect the yield. The oxazolamide indica must be used after the rice leaf is one heart. The indica rice must be used after the four leaves of the rice, and the low temperature or the leaf age is too small, which will cause serious phytotoxicity. In the safety of rice, oxazolamide is less safe, and bispyribyl ether is weaker than penoxsulam. Suitable temperature Pentasulfame has no strict requirements on temperature, and is a good choice in early rice low temperature; bis-cepether requires a temperature between 25 and 35 ° C, and when the temperature is below 15 ° C, the effect is not satisfactory. Lead to phytotoxicity; when the temperature of oxazolamide is above 30 °C, the effect is the best, and the low temperature or the leaf age is too small, which will cause serious phytotoxicity. Backwater and water retention After the application of penoxsulam, it is mainly absorbed by the roots, so the drainage before application and water retention after application is to make the weeds fully medicinal; the cedar ether absorbs 20% of the roots, 80% of the stems and leaves absorb, so the double grass The requirements for ether backwater and water retention are not so high, but the timely return of water and water retention is conducive to the death of weeds, while reducing the adverse effects on rice; oxazolamide is almost absorbed by stems and leaves, so nothing to water Requires that there is water and no water. Dead grass effect When used in a timely manner, penoxsulam can achieve more than 90% of dead grass effect; the dosage is suitable for more than 95% of bis-oxalate; oxazolamide only has a significant effect on the part above the knot, and can achieve 99% of weeding The effect, but the effect on the growth point and the root is not obvious, and the field using the oxazolamide will see a lot of weeds after the rice is harvested. Dead grass speed The death time of penoxsulam weeds at normal temperature is 3 to 5 days; bispyribyl ether is 7 to 10 days, but the temperature is below 20 °C, and the weed death time will take about 15 days; oxazolamide needs 15 days of weeds can die. Cost of use After the rice field direct field, the three-leaf one heart is treated with 40% bis-ice ether suspending agent, and the dosage is 10-12 g, and the cost is about 12-16 yuan/mu. In the rice field, the 2.5% pentosan sulfonate oil suspending agent is used in the second leaf and the dosage is 40 mL. The cost per mu is 14 yuan, but if the time is too busy, especially the rain weather, delay to the three leaves. After that, the amount of 2.5% penoxsulamone oil suspending agent increased to 60ml, the cost per mu increased to 21 yuan, the four leaves and one heart needed 80mL, and the cost reached 28 yuan/mu. 2.5% penoxsulam oil suspension was used after the live broadcast of four leaves and one heart, and the effect was greatly reduced. 40% bis-oxalyl suspension is particularly effective for older valerian, and the more delayed the use, the safer the rice, and the dose does not need to be multiplied. For rice growers, the choice of 40% bis-xyl ether suspension as a chemical weeding in rice field has great advantages in cost. Generally, it costs more than 10 yuan per mu. If you plant 1,000 acres of rice, you need to save more than 10,000 yuan. The oxazolamide indica rice must be used after the rice leaf is one heart. The indica rice must be used after the rice four leaves and one heart. The 10% oxazolamide emulsion oil is 100 mL and 150 mL, respectively, and the cost per mu is 35 yuan and 52.5 respectively. yuan. Therefore, penoxsulam is suitable for use in low temperature conditions, rice two leaves before use; bispyribyl ether is suitable for normal temperature, rice is used after three leaves and one heart; oxazolamide is suitable for resistance to valerian or penoxsulam Use the fire after not in place. More pesticide knowledge , please pay attention to China Pesticide Network
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