Soybean field weed control has "seven treasures"

    What are the herbicides for controlling broadleaf grass after soybean seedlings? The author consulted the relevant information, a total of 7 herbicides can better control.

    ( 1 ) Fomesafen: It is used to control mites, mites, mites, nightshade, wolf grass, comfrey, citron, medlar, giant salamander, chicory, and wattle. 25 % flufenacetate aqueous solution used 67 to 100 ml per acre in the broadleaf weeds 2 to 4 leaf stage , and adding 333 g of urea can improve the herbicidal effect. The use of flufenacil should be well controlled. Premature application, weeds are not seeded, and weeds are not used for weeds that have not been unearthed; application of pesticides is too late, and the resistance of weeds is enhanced, which will reduce the herbicidal effect. It should generally be applied when most weeds are 2 to 4 leaf stage and the broadleaf weeds in the field are basically out. Long-term drought and low temperature affect the efficacy of the drug, but if the temperature is too high, the effect of the stomatal closure of the weed leaves on the absorption of the drug should be avoided.

    ( 2 ) lactofluridin: mainly to prevent cockroaches, cockroaches, cockroaches, nightshade, cocklebur, yarrow grass ( before 3 leaf period), camphor, ramie, iron leeks, wolf grass, water spine needles, etc. Broad-leaved weeds have a certain inhibitory effect on perennial weedy leeks, small cockroaches, big cockroaches and cockroaches. Under drought conditions, the effects on Xanthium, Ramie and Poria were significantly reduced.

    In the 1 to 2 leaf-leaf stage of soybean seedlings , most of the broad-leaved grasses are in the 2 to 4 leaf stage. When the field weeds are basically out, the stems and leaves are treated, and 24 % of the milky grass is used per acre. 30 to 40 ml. Low doses are used under conditions of small weeds and suitable water; high doses are used under large weed conditions and drought conditions, and application should be stopped in severe droughts and temperatures above 27 °C. Fluorinated grass should strictly control the application period, application conditions and dosage, otherwise it will cause phytotoxicity. In general, late-ripening soybean varieties should not use flufenacilin. Spraying flurazepam within 7 hours will reduce the herbicidal effect.

    ( 3 ) chlorpyrifos: mainly to control Xanthium, anti-twig, scorpion, scorpion, thorn, stalk, scorpion, scorpion, sorrel, purslane, bristle, hot pepper, wild Radish, sauerkraut, sorghum, mandala, sorghum, nightshade, comfrey, ragweed, mustard, wild mustard and other broadleaf weeds. Early soybean seedlings, broadleaf weeds 2 to 5 leaf stage. Per acre with 48% bentazone agent 167 ~ 200 ml. Suitable for high moisture, strong weed growth and low doses of weeds, high doses under drought conditions or weeds and perennial broadleaf weeds. For the special effects of Xanthium, 48 % of the herbicide is used to control the use of 67 to 134 ml of cockletalk per acre .

    ( 4 ) Keqiling (Dexamethasone + Acifluorfen ): In addition to the weed species that can be controlled by chlorpyrifos and acifluorfen, it can improve the mites, ramie and yarrow The control effect of broadleaf weeds such as Solanum nigrum L., Chicory, and Brassica. Keqiling applied in 1 to 2 leaves of compound soybeans and 2 to 3 leaves of broadleaf weeds before the 3 leaf stage of comfrey , and about 5 cm of weeds . Mu g of 44% with the spirit herbicidal agent 100 to 133.3 ml, small broadleaf weeds with low levels under field conditions are good humidity; large weeds, a volume under drought conditions.

    ( 5 ) Carbendazim: The killing speed of weeds is fast and has no effect on the sputum. It can be used for post-emergence stem and leaf treatment, effectively preventing a variety of broad-leaved weeds such as alfalfa, alfalfa, alfalfa, Xanthium, Solanum nigrum, E. sinensis, and Daphnia, and also has a certain inhibitory effect on annual grass weeds. B fluoroglycofen soybean 2-3 compound leaf of broadleaf weeds 2-4 leaf stage of application per acre with 10% acetic fluoroglycofen EC 40 to 60 ml of acetic fluoroglycofen Soybean It is safer than acifluorfen.

    ( 6 ) Acifluorfen: early post-emergence stem and leaf treatment can prevent mites, mites and mites ( 2- leaf stage), Solanum nigrum, Xanthium ( before 2 leaf stage), Wolf grass, and comfrey ( 3 leaves) Pre-season), camphor and other annual broad-leaved weeds have strong inhibitory effects on perennial broad-leaved weedy, scorpion, scorpion and scorpion. The application period of acifluorfen should be mastered before the two leaves of soybean , and the broadleaf weeds are applied at the 2 to 4 leaf stage ( about 5 cm in height ), and the cocklebur, cockroach exceeds 2 leaf stage, and the yarrow grass exceeds At 3 leaf stage, the drug resistance is enhanced and the drug effect is not good. Soybeans with more than 2 leaves at the compound leaf stage will aggravate the phytotoxicity. Use 64% to 100 ml of 24 % acifluorfen water per acre . Use low amount when weeds are small, soil and air humidity are high; use high amount when weeds are large and dry. Acifluorfen is susceptible to phytotoxicity in soybeans with poor drainage and long-term accumulation of water in low-lying areas. It is easy to cause phytotoxicity to soybeans when the dosage is too high or under high temperature and drought conditions. If the phytotoxicity is not heavy, the impact on the yield will be small. If the phytotoxicity is serious, the growth period of the soybean will be delayed, and the yield will be reduced by greed and late maturity. When the relative humidity of the air is lower than 65 %, the temperature is lower than 21 °C, higher than 27 °C, and the soil temperature is lower than 15 °C. Usually spray in the morning and evening. After application, it should be guaranteed no rain within 6 hours.

( 7 ) imazamox: can effectively control wild oats, valerian, foxtail, golden foxtail, maiden, medlar, thousand gold, crabgrass, comfrey ( before 3 leaf), Solanum nigrum, ramie , anti-branched scorpion, scorpion, cocklebur, sorghum, willow locust, amaranth, etc., have a inhibitory effect on perennial leeks and thorns. After the emergence of soybeans, two true leaves are spread until the second compound leaves are unfolded. The grass weeds are 2 to 4 leaf stage, the broadleaf weeds are 2 to 7 cm high, and the Xanthium is applied before the 4 leaves. The cockleburs have poor efficacy. The application of the two- leaf stage of the comfrey is best, and the application effect after the 3- leaf stage is poor. Per acre with 4% imazamox agent 75 - 83.4 ml. Weeds are vigorous and weeds are used at low doses, drought conditions and difficult to control weeds for a long time with high doses.