Recently, farmers who have planted corn have asked me why it has no effect in removing herbs. After our analysis and past experience, there are the following reasons.
1. Analysis of the reasons for the poor removal effect of summer corn field
There are two types of herbicides used in summer corn fields: one is the herbicide that seals the ground before the corn seedlings, and the commonly used 40% Yu Nongsi or 42% Yucaojing, acetochlor, 40% acetamidine mixture, Ding A mixture of agents; the second is corn post-emergence herbicides, commonly used 50% Yubao WP or 40% Yunongle suspension, 20% gram tracer, etc. In recent years, some farmers, some farmers It is reflected that the use of herbicides on the closed ground of corn seedlings is not very satisfactory. The use of corn seedlings after herbicides is not safe to cause phytotoxicity to corn. According to the investigation and analysis of our technicians, there are mainly the following reasons.
1.1 Spraying period or improper use, the effect is poor. Our commonly used corn post-emergence pre-emergence herbicide sprays the ground before the emergence of corn, so that a layer of closed agent is formed on the surface of the ground. When the local weeds germinate, no matter whether the roots or the young shoots touch the drug layer Will be poisoned and died. Corn has ketone enzymes in the body, which can break down herbicides into non-toxic substances and is safe for corn. Since such herbicides are selective herbicides and are sensitive to grass weeds, they are poorly used in corn fields with broadleaf weeds. Weeds are mainly absorbed by young shoots, and stems and leaves are rarely absorbed. Weeds have better effect before 3 leaves, and have a poor effect on large grasses.
1.2 Corn field has low water content and high temperature. Because the season of using herbicides in summer corn fields is the high temperature season from late June to early July, soil moisture is greatly evaporated. In case of drought, soil moisture is small, farmers still spray according to conventional methods, spraying every 667 square meters. 30 kilograms of water, and most of the machine cut wheat wheat high, some of the medicine sprayed onto the wheat stubble, some of the medicine is evaporated by the sun, the amount of medicine infiltrated into the soil is very small, and even the soil layer cannot be closed, the weeds are not poisoned by the medicine, there are The growing weeds, even if they encounter a very thin layer of medicine, have a short poisoning time and will not die, and still extend out of the ground.
1.3 The use of the herbicide herbicide method improperly produces phytotoxicity. When corn seedlings are used for weeding in corn fields after stalking or paraquat, the protective agent is not used for spraying, so that the herbicide liquid is sprayed onto the corn plants, which also kills the corn seedlings, so it is easy to spray. Produce phytotoxicity.
2, technical measures to improve the use of effects, according to different growth stages of corn, choose different weeding techniques.
2.1 is the soil closure treatment of summer corn after sowing, before the seedlings, 667 square meters with 40% Yu Nongsi or 42% Yucaojing, acetochlor, 40% Ea mixture and other agents 150 ~ 200 grams of water 40 ~ 50 kg Spray on the surface and carry out soil sealing treatment. If there is grass in the field when applying the medicine, add 20% to 150 grams of the herbicide 20% gram of the herbicide, which can prevent the unearthed weeds and kill the grass in the field. The soil should be kept when the soil is closed. Better humidity, the wheat harvested wheat field is higher, should increase the amount of medicinal water appropriately, spray at least 70-80 kg of water per 667 square meters during the drought, spray evenly, do not re-spray, not leak during the application process Spraying; spraying after spraying water after sowing, the sealing layer of the agent will deepen with the underwater seepage, the effect will be greatly improved; the spraying time should avoid the high temperature at noon, before the morning sun does not come out or after the afternoon sun sets, This means that the heatstroke improves the spraying effect.
2.2 After the seedlings, the stems and leaves are not treated with soil sealing treatment or the blocking effect is not good. After the summer maize seedlings are 3 to 5 leaf stage, the weeds are 2 to 4 leaf stage, and the 667 square meters can be used with 50% Yubao wettability. Powder 90 g or 40% Yu Nong Le suspending agent 67 ~ 100 ml, spray 25 ~ 35 kg of water, the use of organophosphorus pesticides is prohibited within 7 days before and after treatment.
2.3 Directional spray treatment in the field In the 5-6 leaf stage of summer maize, 667 square meters can be used with the herbicide herbicide 747, 20% gram of tracer water 100-150 grams, 30 kilograms of water, spray in the sprayer Use a protective cover on the spray head and spray the weeds to avoid spraying the liquid onto the corn seedlings, causing phytotoxicity.
Farmers should take a good look at the measures to improve the effect. This way, it will not be in vain. After all, the farm work is so tired, of course, the return after paying is good.
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