The latest usage of herbicides in Corn Field

The use of herbicides in corn field, the main weeds in corn field are Equisetum, amaranth, Chenopodium, Chenopodium, Portulaca oleracea, amaranth, amaranth, quinoa, amaranth, green amaranth, quinoa, amaranth, abutilon, wild watermelon seedlings, axillary amaranth and other weeds. Perennial weeds include Spirulina, Reed, Rhizoma Cyperi, and so on. Let's take a look at the use of herbicides in corn fields.

Pre-seedling herbicide after sowing

1. 40% ethyl atrazine water suspension (ethyl A mixture)

40% atrazine water suspension is a special herbicide for corn field. it has excellent control effect on annual Gramineae weeds in corn field, such as Equisetum, Setaria angustifolia, Euphorbia angustifolia, Euphorbia angustifolia, Elymus, Kentucky bluegrass, etc., and annual broad-leaf weeds such as Chenopodium, Polygonum, amaranth, Solanum nigrum, Portulaca oleracea, iron amaranth, plaster, plaque, ground skin, flying cream, small white grass, duck foot grass and so on. It also has obvious inhibitory effect on sedges and weeds.

40% atrazine water suspension agent not only has a wide herbicidal spectrum, but also has high herbicidal activity and long service life, and is safe for corn and subsequent crops, such as wheat. 40% atrazine water suspension emulsion is used per minute from before the seedling of corn sowing to the 3-leaf stage of weeds after corn emergence. The effect period of summer corn in North China is 2250 to 3000 grams, spring corn in North China is 2250 to 3750 grams, and spring corn in Northeast China is 4500,000 grams, about 750 liters of water is added, and the field effect lasts for 50 days. A single use of medicine can ensure that the whole growth period of corn is free from weeds.

The herbicidal effect of atrazine water is closely related to the soil moisture. The herbicidal effect is good when the humidity is high, but low when the soil is dry. It is usually necessary to irrigate the amount of water or rain once before application, and it is best to apply it before the weeds are unearthed in order to ensure that the efficacy can be brought into full play. If the drug is used before the 3-leaf stage of the weeds and after the 4-leaf stage of the weeds, if the grass age is too old, the efficacy will decrease due to the increase of weed drug resistance, and the dosage should be reduced when using this agent in sandy soil with low organic matter content.

2. Yibao bucket mixture

The mixture of Acetochlor and Acetochlor is a root mixture made from Acetochlor and Baoshou, which can be used to effectively control annual Gramineae and annual and some perennial broad-leaved weeds in corn field and intercropping field of corn and soybean. the field effective period of 30 to 60 days is safe for crops such as corn, soybean and wheat. Apply pesticide before sowing or before seedling after sowing. In spring corn fields in Northeast China, 3000 milliliters of Acetochlor per hectare and 1500 milliliters of Acetochlor per minute plus 1500 grams of Acetochlor per minute in summer corn (or soybean) fields are sprayed evenly. When dispensing, first put the treasure in a small cup and mix it with a small amount of warm water into a mother liquid, pour it into a mixture bucket with half of the water, then add Acetochlor, and then add the other half of the water to stir well, the fan-shaped sprinkler has the best effect.

3. 50% Hebao EC

50% Hebao EC is a new herbicide with high efficiency, broad spectrum and safety. It can effectively control a variety of annual Gramineae weeds and broad-leaved weeds, it is the most effective against Tripterygium przewalskii, Echinochloa barnyardgrass, Saxifraga, Saxifraga, Chenopodium, Chenopodium, amaranth, purslane, amaranth, sausage and Solanum nigrum, and it also has obvious inhibitory effect on some perennial weeds and Cyperaceae weeds.

50% Hebao EC can be used not only for soil closure before sprouting, but also for stem treatment before the 3-leaf stage of weeds after maize emergence. With 1.2-1.5 liters of 50% Hebao EC per minute and 750 liters of water, it can effectively control a variety of weeds. There is a close relationship between soil moisture and efficacy, and the efficacy is high when the humidity is suitable for moisture. The drug is sensitive to weed buds and has the best effect in the early stage before sprouting or seedling after corn sowing.

4. 50% du A mixture

Before the seedlings after corn sowing, 50% of the mixture was 2: 35 kg per hectare and 750 liters of water was added and sprayed evenly on the soil surface. it has a good control effect on annual grasses and annual broad-leaf weeds such as Artemisia mandshurica, Euphorbia angustifolia, Saxifraga, Chenopodium, amaranth, amaranth, plaque, intestine, Xanthium sibiricum, Portulaca oleracea, Solanum nigrum, cotton, etc.

5. Atrazine (atrazine)

Atrazine is a selective pre-budding and post-sprouting herbicide of triazobenzenes. it can be used to control annual monocotyledonous and dicotyledonous weeds such as Setaria paniculata, Setaria angustifolia, Saxifraga, Shepherd's purse, Snakehead, Xanthium, Portulaca oleracea, Solanum nigrum, Euphorbiaceae, Leguminosae, etc., and also has a de facto inhibitory effect on some deep-rooted weeds.

Before the seedlings after corn sowing, 38% atrazine suspension 2.25 kg per minute was used, and before the 3-leaf stage of weeds, 38% atrazine was used per minute, and 750 liters of water was added to spray evenly.

Atrazine has good efficacy, good selectivity to corn and is very safe, but the residual period in the field is as long as 120-160 days. If it is not used properly, the following crops will cause drug damage. It is necessary to strictly control the dosage, do not increase the dosage at will, and pay attention to uniform application to avoid re-spraying and leakage spraying. Atrazine can be mixed with Acetochlor, Duer, Rasol and Caojingjin, which not only expands the herbicide spectrum, but also reduces the soil residue, which is safe for recommended wheat.

6. Acetochlor

Acetochlor is an amide selective pre-bud herbicide. Acetochlor has a special effect on annual Gramineae weeds such as Saxifraga, Tripterygium, barnyard grass, bristlegrass, thrush, Kentucky bluegrass, wild millet and so on. Acetochlor also has a good control effect on broad-leaved weeds such as quinoa, Polygonum polygonum, amaranth and purslane. Acetochlor can be degraded into non-toxic substances quickly after absorbing Acetochlor, so it is safe for corn before sowing. Northeast China uses 50% Acetochlor EC 2.25-3.75 kg per hectare, North and south China uses 50% Acetochlor EC 1.2-2.5 kg per hectare, adds 750 liters of water to spray the surface evenly, and the amount of plastic film covering the field is reduced by about 1 to 3.

The dosage should be increased in the areas with fertile soil and high content of organic matter, while the dosage should be reduced in the areas with barren soil and low organic matter content. High soil moisture is conducive to the absorption of herbicides by weed seeds, and the effect is good, and soil drought affects the efficacy. Therefore, it is best to irrigate the land or rain before application, so that the soil has good moisture.

7. Duer (Metolachlor)

Duer is a selective pre-bud soil treatment herbicide, and the control effect of Gramineae weeds is better than that of broad-leaved weeds. Before the emergence of corn after sowing, spray evenly with 72% Dol EC 1.2-1.8 kg per hectare and 750 liters of water. Use a low amount of sandy soil and a high amount of clay, such as when the soil surface is dry, it is best to mix the soil shallowly.

8. Lazol (alachlor)

Rasol is an amide selective pre-bud herbicide with high herbicidal activity and a guilt-free period of 4-8 weeks in soil. It can effectively control annual Gramineae weeds and some annual dicotyledonous weeds. Before the seedlings after corn sowing, eat large pot rice with 3-4.5 thousand EC per hectare, add 750 liters of water and spray evenly. If rain or irrigation occurs within one week after application, it is beneficial to bring the efficacy into full play. Under dry conditions, the soil should be mixed with a depth of 2cm to 4cm, which can improve the weeding effect.

9. Hornes

Hornus is an amide selective pre-bud herbicide, which has a special effect on annual grasses and broken rice, such as barnyardgrass, Setaria angustifolia, Euphorbia angustifolia and so on. It also has a control effect on Polygonum, Chenopodium, amaranth, duckweed, Solanum nigrum, Portulaca oleracea, Radix Aconitum and so on. Weeds should be applied before emergence, but they cannot be killed after they sprout and grow. Before planting corn after sowing, 0.9-1.2 litres per hectare of 90% Hornes EC was used in North China, 1.5-1.8 litres in Northeast China, 0.6-0.9 litres in the Yangtze River Basin and South China, 450 litres of corn covered with plastic film, 600 liters of water added, and sprayed on the surface. After applying the formula, a certain amount of soil moisture is needed to give full play to the efficacy of the drug. In areas with drought or less rainfall, soil treatment can be used before sowing, shallow soil 2-3 cm after application, and sowing after mixing.

10. Mixed use of herbicides

Different herbicides have different herbicide spectrum. although the herbicide spectrum of some herbicide varieties is relatively wide, the herbicide spectrum is limited due to the limitation of crop safety, and some herbicides have high water solubility or long effective period in the field. excessive dosage or uneven application are easy to cause residual toxicity to current crops or subsequent crops. Therefore, the herbicide spectrum is different in production, and the two herbicides with complementary advantages and disadvantages are properly reduced and mixed, which not only expands the herbicide spectrum and significantly improves the weed control effect, but also avoids the possibility of drug damage to current crops and residual toxicity to stubble crops.