The three components, such as bispyribyl ether, penoxsulam and oxazolamide, are all selective post-selective herbicides for rice seedlings. 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 is analyzed from many aspects for selection and reference.
In terms of control objects: all three components are 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 garland (red mixed root), and the rice larvae (the grass), and has certain control effects on some broad-leaved grasses (spicy oysters, ragweed, and 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: bispyribyl ether is safer for japonica rice, but sensitive to japonica rice and japonica rice. Some varieties of rice will have slight or severe chlorosis and whitish phenomenon, but usually recover in 7-10 days, the final yield of rice no effect. The application time of bispyribyl ether is strictly required. It is required to be used after the direct broadcast of indica rice, and the indica rice is used after four leaves and one heart. It is forbidden to use during the booting stage of rice. 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: penoxsulam has no strict requirements on temperature, and is a good choice in early rice low temperature; bis-cepether requires temperature between 25 and 35 °C, and when the temperature is lower than 15 °C, the effect is not satisfactory. It may also cause phytotoxicity; when the temperature of oxazolamide is above 30 °C, the effect is best, and if the temperature is low or the leaf age is too small, serious phytotoxicity will occur.
Backwater and water retention: After application of penoxsulam, it is mainly absorbed by roots, so drainage before application and water retention after application is to make the weeds fully medicinal; bispyribyl ether 20% root absorption, 80% stems and leaves Absorption, so the requirements of psyllium ether for 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 there is no requirement for water, there is water and no water.
The effect of dead grass: when used in a timely manner, penoxsulam can achieve more than 90% of the dead grass effect; the dosage is suitable for more than 95% of bis-oxalate; oxazolamide only has obvious effect on the part above the knot, A weeding effect of 99% is achieved, but the growth point and the root effect are not obvious. The field using oxazolamide will also see many weeds after rice harvesting.
The speed of dead grass: the death time of penoxsulam weed at normal temperature is 3 to 5 days; the bis-oxalate is 7 to 10 days, but the temperature is below 20 °C, and the weed death time will take about 15 days; Zymphalin requires 15 days of weed to die.
In terms of cost of use: rice is used in the field of three leaves and one heart, and the dosage of 40% bispyribyl ether suspension is 10-12 g, and the cost is 12-16 yuan/mu. The rice direct seeding field uses 2.5% penoxsulam dispersible oil suspension agent in the second leaf and one heart. The dosage is 40 mL, but the cost is 14 yuan, but if the time is too busy, especially the rain weather, delay to three. After Ye Yixin, the amount of 2.5% penoxsulam dispersible oil suspending agent should be increased to 60 mL, the cost per mu should be increased to 21 yuan, and the cost of four leaves should be 80 mL. The cost would be 28 yuan/mu. 2.5% penoxsulam dispersible oil suspension agent is used after the live broadcast of four leaves and one heart of rice, and the effect is 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-humyl ether suspending agent 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 mu 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. 52.5 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.
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