Maize seedling stage is also the time when many weeds germinate and grow. Weeds and corn compete for water, nutrients, light and space, affecting the normal growth of maize seedlings. It will even cause serious reduction of production.
There are two ways to weed the field. The first is artificial scratching. The method of weeding by means of artificial scratching can increase the permeability of the soil and has the effect of resisting drought and flooding. The disadvantage is that labor is time-consuming and labor efficiency is low. The second is weeding with chemical agents. When weeding chemicals and chemicals, the weeding effect is good. However, improper use can also cause damage to corn and its subsequent crops.
In the corn field, dicotyledonous weeds are often mixed with monocotyledonous weeds. Therefore, the herbicide must be properly selected according to the occurrence of weeds in the field. At the same time, different types of herbicides should be selected according to different use periods.
1, soil treatment agent. The soil treatment agent is the herbicide used before seedling of corn. Mainly used in the weeding of corn covered with corn, spring corn and stubble after weeding. Commonly used herbicides include acetochlor, lansoline, dole and other amide herbicides. Acetochlor can effectively control annual monocotyledonous weeds such as crabgrass, marmot, green foxtail, and goosegrass. It also has certain control effects on some small seeded dicotyledonous weeds such as purslane, but it is also effective against perennial weeds. invalid. Soil treatment agents have a long duration of effect and have an effect on weeds that germinate in succession. Since the main absorption sites of the above-mentioned weeds are the young shoots and the young roots, it is necessary to apply the weeds before they are unearthed. Use 50% acetochlor EC 100-140 ml per acre, 72% Dore EC 90-180 ml, 48% Rope EC 200-250 ml, dilute with 30 kg water, and spray on the soil surface with a sprayer. The efficacy of acetochlor and other drugs is greatly affected by soil moisture, soil moisture is good, rainfall or irrigation after application, weeding effect is obvious. Therefore, the amount of water should be appropriately increased during drought, and can be increased to 50 kg per acre. The liquid mixture should be diluted with 2-3 centimeters deep after the application of pesticides.
2, stem and leaf treatment agent. The stem and leaf treatment agent is the herbicide used in the weed seedling stage. Generally used before the corn 5 leaf stage. Since herbicides are also applied to weeds, they are also exposed to corn, so selective herbicides must be used. Common herbicides include: Atrazine, Trichosulfin, Jade, and Ethylene Suspension, Dua Mixture, etc. Corn stem and leaf treatment is commonly used 40% atrazine rubber suspension, Atrazine is atrazine, is a systemic herbicide. Both dicotyledonous weeds and monocotyledonous weeds have better control effects. When deferred to stems and leaves for treatment, the appropriate application time is 3-5 leaves of corn and 2-5 leaves of weeds. At the 3-5 leaf stage of summer maize, most of the weeds in the field have been unearthed and are in the 2-5 leaf stage. Generally, 40% atrazine suspension concentrate 150-200 ml per mu is used. Use 30 kg of water to dilute the agent and evenly spray it on the soil around the weeds and weeds. Rainfall after spraying, irrigation, liquid infiltration, is conducive to root absorption agents, weeding effect is obvious. When drought occurs, the amount of water should be appropriately increased. In particular, the corn field where wheat is harvested by wheat is used to increase the amount of water used for diluting pesticides, and the amount of spray should be increased. The soil should be sprayed evenly, causing a certain amount of humidity and giving full play to its efficacy. The combination of herbicides can overcome the disadvantages of Atrazine in producing phytotoxicity on the next wheat crop. The combination of atrazine and acetochlor and other amide herbicides reduces the amount of atrazine used, which is safe for the next bran wheat and improves the weed control effect. The following formulas can be used when mixing the following formula per acre: 50% acetochlor EC 50-100ml + 40% Indolazide gel suspension 100-200ml; 72% Dole EC 50-90ml + 40% Atrazine Suspension 100-200ml; 43% Lacoste EC 100-150ml + 40% Atrazine gel suspension 100-200ml. Mixtures of this kind can also be used for soil treatment. Jade Farm Music is also a corn field stem and leaf treatment agent, which has a good effect of controlling monocotyledonous weeds. It should be noted that the use of any herbicide has a certain period of safe use and a safe dose, and it must be used in strict accordance with the instructions for use in order to avoid unnecessary losses.
Intermediate for CAS 19774-82-4
Amiodarone Hydrochloride Intermediate,Amiodarone Hydrochloride Api,Amiodarone Hydrochloride,2-Butylbenzofurane Intermediate
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