The community composition of farmland weeds is varied. Mixing herbicides can increase the herbicide spectrum, reduce the amount of pesticides, and reduce production costs. Reasonable mixing can reduce pesticide residues and improve the safety of crops; after a reasonable mix, it can be extended or shortened. The drug efficacy period can be flexibly adjusted for the appropriate period of application. However, the mixed use of herbicides is principled, and a good combination of combinations should be selected or determined depending on the circumstances.
When herbicides are used in combination, it is necessary to understand the herbicide spectrum, crop resistance, climate, and the influence of soil on the herbicide activity of each herbicide, the site of absorption of the herb by plants, and the conduction and metabolism in the body, and the status of the herbicide in the soil. Use principles, etc., and then come up with effective combination of matching, so as to receive the desired effect. Generally should follow the following principles: 1. Herbicide spectrum different herbicides mixed, we must be able to expand the scope of weeding and improve control effectiveness. Most of the herbicides currently used are selective, and herbicides with different herbicidal spectrums are used in combination. The mechanism of action should be able to complement each other and prevent more types of weeds. For example, the combination of acetochlor with atrazine or saikod can significantly expand the scope of weeding; paddy field weed control can use Huicao Ling in combination with propanil and butachlor to control annual weeds and including Cyperaceae. Perennial weeds are used before or after rice transplanting. The combination of ethyl fluoroxaflor and glyphosate can not only control the weedy purslane and iron amaranth, but also improve the weeding effect of glyphosate. There are many weeds in the castor field. Simimasin is used alone. The weeding spectrum is too narrow. If it is mixed with dimethyl tetrachloride, 50-60 grams of Simazine is used, mixed with dimethyl tetrachloride, and sprayed with 50 kg of water. Application of ramie before emergence, control of grass and broadleaf weeds is effective. Mixed herbicides must have different herbicide profiles, but the applicable crop, application period, and method of use must be consistent.
2. To extend the duration of weeding and reduce the number of medications. When herbicides are used, they should be mixed with herbicides with a long pot life and a short duration of potency to provide complementary effects. Not only can we control the weeds that sprouted in the early stages, but we can basically control the weeds during the whole crop growth period. . For example, if we use 10% rice straw-free WP in early paddy fields to treat early buds, we can control annual and perennial broad-leaved weeds and sedges; if we add butachlor, we can increase the effect of removing mites and achieve Once medication, rice fields have no purpose in all seasons. Over the years, wheat fields have used mainly 2,4-D, dimethyl tetrachlorine and other herbicides, resulting in the damage of grassy weeds and resistant broad-leaved weeds such as citrons, coiled stems, etc., while 2,4-D Herbicides have a narrow period of application. In order to overcome the above-mentioned shortcomings, the use of dicamba and 2,4-dose in combination has broadened the spectrum of herbicide killing and extended the application period. It can be extended to 1 to 3 times in wheat crops. Festival period. In the production, the cotton field uses 25% diuron + 50% cable 150g per acre, the efficacy is better than 250g with a single cable; the trifluralin + cable + 50g each of the 50 grams of grass, control flower The annual grass weeds and certain broad-leaved weeds are better than the trifluralin alone and have a long duration. When mixing, herbicides with different grass-killing principles should be used as much as possible to improve the herbicidal effect.
3. Reduce phytotoxicity and improve safety. After the herbicides are properly mixed, the residual toxicity is smaller than that of the single herbicide, and the crop safety is improved. The use of a mixture of herbicides is usually less than half of the single dose, which avoids the toxicity of herbicides to certain crops. According to the experiment, Bendazon alone used 50 grams per acre and was used before the branch of the piglet before winter, and the control effect of the weeds such as swine fever and Maijiagong was more than 95%; , 40 grams per acre, the control effect of the first two weeds is only 46% and 65%; and per acre with 30 grams of Bendazon plus dimethyl tetrachlorine 20 grams mixed, control effectiveness of more than 95%, after mixing Wheat ear spikes decreased by 3.2% when compared with dimethyl tetrachlorine alone. Some herbicides have a long residual period and can affect the crops. If they are mixed with herbicides with a short residual period and a low toxicity, they can avoid phytotoxicity and reduce the impact on the crop. For example, when chlorotoluron is used alone, more than 300 g is easy to produce phytotoxicity, and it is not safe for sorghum rice. However, the use of chloroalcohol halved in combination with herbicidal dandan not only protects the wheat field from phytotoxicity, but also facilitates the stumbling of rice. Safety. Another example is the fact that indole can prevent most of the weeds in corn fields to work well and is safe to corn, but it has residual phytotoxicity to crops other than corn. If mixed with acetochlor, the herbicidal effect can reach 95% or so. In addition, the safety of the crops under the locust crops has been greatly improved without the occurrence of phytotoxicity. Practice has shown that if atrazine is used at high doses for many years, weeds like weeds and crabgrass will be resistant to atrazine. The herbicidal effect of Atrazine is significantly reduced, and after mixing, the production of drug resistance can be delayed and the pressure to form resistance can be reduced.
4. Improve the weeding effect. Herbicides have a significant synergistic effect after rational use. For example, a mixture of diterpenoids (metachlor + glutamicum) has herbicidal action with amides and substituted urea herbicides, and the effect is enhanced. The spectrum of grass is enlarged, and most 1-year-old monocotyledonous and broadleaf weeds can be controlled. . Dimethyl tetrachloride and diuron, paraquat, kill grass Dan, Da Zhuang and other mixed use. According to the herbicide mixed with herbicide spectrum test observation: Praxanthine net alone, is not valid for small convolvulus, but if per acre with 10 grams of prochloraz and dimethyl tetrachlorm mixed 30 g, the control effect of small convolvulus Good; Diuron alone, poor control effect on Ze lacquer and big celery, but if 7.5 grams of diuron per acre and 30 grams of dimethyl tetrachlorm are mixed, it is effective for Ze lacquer, and it is effective for big oysters. The control effect is better; the enemy quail alone is used, but it is not effective for big broccoli, lacquer, leeks, wormwood, mustard, ion grass, etc., but 30 g per mu is mixed with tetrachloromethane for the above. The weeds are highly efficient; dimethyl tetrachlorine is used in combination with herbicidal dandan and Chinese wolfberry, and can be used to remove broad-leaved weeds such as paddy field rind and knot-knot. Wheat is 15% oxalic acid WP, ​​suitable for control of a variety of grassy weeds in wheat fields; fast kill Ling, Pentium, etc. is suitable for the control of broadleaf weeds and sedge in wheat fields, which can effectively prevent the use of wheat fields Most grassy weeds, broadleaf weeds, etc. In addition, the temperature requirements for the application of phenomenone and quercetin are not very strict, and they have better weed control effect in the low temperature period. The combination of Maiji and Qunlingling or Pentium uses a combination of wheat safety, herbicide spectrum expansion and good weed control. It is an excellent compounding combination.
Disclaimer: Some articles in this website have been transferred from the Internet. If you are involved in third party legal rights, please inform this website. phone
We are the supplier of high quality 100% recycled fabric Change Robe, waterproof change robe, long sleeve Adult Change Robe. Warm Change robe.
Waterproof Dry robe features:
1. 100% waterproof
2. High quality 100% recycled nylon fabric
3. big change space
4. YKK Zip
Sample with customized design and logo are available.
Welcome to discuss the details.
Waterproof Change Robe,Waterproof Change Robe,Surfing Change Robe,Swimming Change Robe
Suzhou Golden Gamrnet MFG Co.,Ltd , https://www.suzhoumfg.com