Summer seedling corn is in high temperature and rainy season, and weeds in corn fields are widespread and varied. According to the results of the National Weed Census, there are 22 families, 38 genera, and 43 species of weeds in the corn field. The main weeds are crabgrass, madder, green foxtail, goosegrass, amaranthus, purslane, iron amaranth, and fragrant grass. Aconite and so on. Corn seedlings are most seriously harmed by weeds, so chemical control of weeds should focus on the two critical periods before and after seedling.
First, the main herbicide single agent species
1. Amide Herbicides: It is the most important class of herbicides in corn fields at present. It can be absorbed by weed buds. It can effectively prevent and control annual weeds and part of annual broad-leaved weeds before weeds germinate. There are many varieties of herbicides such as acetochlor, alachlor, butachlor, metolachlor, and isopropyl chloride. Tests have shown that: at the same effective dose, the comparison result of herbicidal activity is Acetochlor> Metolachlor> Propisochlor> Butachlor> Alachlor; According to its effective amount, the quantitative comparison result of herbicidal activity is B Oxalamine: Metolachlor: Butachlor: Propisochlor was 1:0.9:0.8:0.7; herbicides of this type were greatly influenced by the moisture content, and the herbicidal effect was significantly reduced when the herbicides were poor.
2. Triazine herbicides: It can effectively control annual broad-leaved weeds and annual grass weeds. It is mainly absorbed by the roots of weeds, and it can also absorb small amounts of weed stems and leaves. Representative varieties are Atrazine, Cypermethrin, Simazine, Praxefine, etc., Of which, Atrazine is used more often, it is safer and the highest activity is for corn, but it is mixed with acetochlor to reduce dosage. Improve weeding and post-harvest crop safety.
3. Phenoxycarboxylic acid herbicides: Mainly in the post-emergence control of broadleaf weeds and Cyperus bracteatum. Representative species are 2 A 4 sodium chloride, 2,4-D butyl ester. Among them, 2A 4 sodium chloride salts are widely used in corn field to control the aconite roots, but the use period is not easy to produce phytotoxicity.
4. Sulfonylurea herbicides: Nicosulfuron, rimsulfuron can be used to control grassy weeds, Cyperaceae weeds and some broad-leaved weeds in corn fields, and thiazolyl can be used for corn field control. Annual broadleaf weeds.
5. Other herbicides: Paraquat and glyphosate are all-emergent herbicides. They can be sprayed after corn is 40 centimeters in height to effectively control a variety of weeds; they can also be used to make it long, herbicide, bromoxynil, Bentazon and other varieties control broadleaf weeds in corn fields.
Second, the main herbicide mixture type
1. Acetochlor and atrazine 1:1 mixture: The earliest production of this type of herbicidal mixture is Ethylene Mixture (Acetonitrile Suspension), which can be used to prevent and control annual pods before and after corn seeding. Undergraduate weeds and broad-leaved weeds are safe for corn and post-crop crops. Similar products are butachlor + acetochlor + atrazine, butachlor + atrazine, alachlor + acetochlor + atrazine, metolachlor + atrazine, propiprofen + Atazin et al.
2. Acetochlor and atrazine 2:3 mixture: This herbicidal mixture can be used to prevent and control annual weeds and broad-leaved weeds in maize fields after maize sowing and in the early post-seedling corn period, and it is safe for corn; In particularly drought years, the safety of post-uptake wheat may be reduced. The similar performance of the variety is chlorotoluron + acetochlor + atrazine mixture, greatly improving the safety of post-planting wheat, but not for post-seedling corn.
3. Prometryn and Atrazine Complex: It can effectively control annual gramineous weeds and broad-leaved weeds in corn fields. The pre-emergence weed control effect after corn sowing is stable, and is affected by the degree of lyrics. However, if the rainfall is large, more leaching will reduce the effect of weeding. In corn growing season, adverse environmental conditions such as high temperature and drought can induce corn medicine. harm.
4. Nicosulfuron and atrazine mixture: It is an ideal mixture of herbicides, not only can effectively control a variety of annual weeds, but also can control perennial grass weeds and Cyperaceae weeds, easy to use The safety of corn and post-crop crops. However, the herbicide mixture has a higher price.
5. Acetochlor, atrazine, and paraquat mixture: Both the loss of life and closed weeding effect, applied in the corn growing period can effectively control a variety of weeds in the corn field. There are many similar products, but there are herbicide mixtures that replace paraquat with glyphosate.
3. Weeding at the sowing date for herbicide dosage in corn field, using 150 to 200 ml/mu of E-A mixture; 50% of Ebel wet powder at 90 g/mu, or 38% at early post-emergence (1 to 4 leaf stage for maize) Atrazine Suspension 75 to 100 ml/mu +4% Nicosulfuron Suspension 75 to 100 ml/mu; corn can be used in the mid-growth 10% Glyphosate 200 to 300 ml/mu, 20% paraquat water 100-150 ml/acre, or 40% acetic suspension 150 ml/acre + 20% paraquat 100-150 ml/seedling, directed and sprayed under windless conditions.
First, the main herbicide single agent species
1. Amide Herbicides: It is the most important class of herbicides in corn fields at present. It can be absorbed by weed buds. It can effectively prevent and control annual weeds and part of annual broad-leaved weeds before weeds germinate. There are many varieties of herbicides such as acetochlor, alachlor, butachlor, metolachlor, and isopropyl chloride. Tests have shown that: at the same effective dose, the comparison result of herbicidal activity is Acetochlor> Metolachlor> Propisochlor> Butachlor> Alachlor; According to its effective amount, the quantitative comparison result of herbicidal activity is B Oxalamine: Metolachlor: Butachlor: Propisochlor was 1:0.9:0.8:0.7; herbicides of this type were greatly influenced by the moisture content, and the herbicidal effect was significantly reduced when the herbicides were poor.
2. Triazine herbicides: It can effectively control annual broad-leaved weeds and annual grass weeds. It is mainly absorbed by the roots of weeds, and it can also absorb small amounts of weed stems and leaves. Representative varieties are Atrazine, Cypermethrin, Simazine, Praxefine, etc., Of which, Atrazine is used more often, it is safer and the highest activity is for corn, but it is mixed with acetochlor to reduce dosage. Improve weeding and post-harvest crop safety.
3. Phenoxycarboxylic acid herbicides: Mainly in the post-emergence control of broadleaf weeds and Cyperus bracteatum. Representative species are 2 A 4 sodium chloride, 2,4-D butyl ester. Among them, 2A 4 sodium chloride salts are widely used in corn field to control the aconite roots, but the use period is not easy to produce phytotoxicity.
4. Sulfonylurea herbicides: Nicosulfuron, rimsulfuron can be used to control grassy weeds, Cyperaceae weeds and some broad-leaved weeds in corn fields, and thiazolyl can be used for corn field control. Annual broadleaf weeds.
5. Other herbicides: Paraquat and glyphosate are all-emergent herbicides. They can be sprayed after corn is 40 centimeters in height to effectively control a variety of weeds; they can also be used to make it long, herbicide, bromoxynil, Bentazon and other varieties control broadleaf weeds in corn fields.
Second, the main herbicide mixture type
1. Acetochlor and atrazine 1:1 mixture: The earliest production of this type of herbicidal mixture is Ethylene Mixture (Acetonitrile Suspension), which can be used to prevent and control annual pods before and after corn seeding. Undergraduate weeds and broad-leaved weeds are safe for corn and post-crop crops. Similar products are butachlor + acetochlor + atrazine, butachlor + atrazine, alachlor + acetochlor + atrazine, metolachlor + atrazine, propiprofen + Atazin et al.
2. Acetochlor and atrazine 2:3 mixture: This herbicidal mixture can be used to prevent and control annual weeds and broad-leaved weeds in maize fields after maize sowing and in the early post-seedling corn period, and it is safe for corn; In particularly drought years, the safety of post-uptake wheat may be reduced. The similar performance of the variety is chlorotoluron + acetochlor + atrazine mixture, greatly improving the safety of post-planting wheat, but not for post-seedling corn.
3. Prometryn and Atrazine Complex: It can effectively control annual gramineous weeds and broad-leaved weeds in corn fields. The pre-emergence weed control effect after corn sowing is stable, and is affected by the degree of lyrics. However, if the rainfall is large, more leaching will reduce the effect of weeding. In corn growing season, adverse environmental conditions such as high temperature and drought can induce corn medicine. harm.
4. Nicosulfuron and atrazine mixture: It is an ideal mixture of herbicides, not only can effectively control a variety of annual weeds, but also can control perennial grass weeds and Cyperaceae weeds, easy to use The safety of corn and post-crop crops. However, the herbicide mixture has a higher price.
5. Acetochlor, atrazine, and paraquat mixture: Both the loss of life and closed weeding effect, applied in the corn growing period can effectively control a variety of weeds in the corn field. There are many similar products, but there are herbicide mixtures that replace paraquat with glyphosate.
3. Weeding at the sowing date for herbicide dosage in corn field, using 150 to 200 ml/mu of E-A mixture; 50% of Ebel wet powder at 90 g/mu, or 38% at early post-emergence (1 to 4 leaf stage for maize) Atrazine Suspension 75 to 100 ml/mu +4% Nicosulfuron Suspension 75 to 100 ml/mu; corn can be used in the mid-growth 10% Glyphosate 200 to 300 ml/mu, 20% paraquat water 100-150 ml/acre, or 40% acetic suspension 150 ml/acre + 20% paraquat 100-150 ml/seedling, directed and sprayed under windless conditions.
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