What is the best method for weed control at the corn seedling stage
What method is used for weed control in corn seedlings? Here is an introduction. For weed control in corn seedlings, you can refer to the following points: 1. Correctly choose a post-emergence herbicide: In experiments in recent years, herbicides with relatively good post-emergence weed control effects in corn include Gengjie, Qiancenghong, Miaohoubao, etc. before the corn reaches 5 leaves; after 8-10 leaves, when the plant height reaches 60 cm, ...
What method is used for weed control in corn seedlings? Please give an introduction
For weed control in corn seedlings, you can refer to the following points:
1. Correctly choose a post-emergence herbicide: In experiments in recent years, herbicides with relatively good post-emergence weed control effects in corn include Gengjie, Qiancenghong, Miaohoubao, etc. before the corn reaches 5 leaves; after 8-10 leaves, when the plant height reaches 60 cm, you can also choose paraquat, Gramoxone, etc.
2. Master the optimal spraying time. The best time for post-emergence weed control in corn is the 3-5 leaf stage of corn, when corn has high resistance and is less prone to herbicide damage. Herbicides containing nicosulfuron should be applied as much as possible before the 5-leaf stage of corn; after the 5-leaf stage, herbicide damage is more likely, and when applying the herbicide, high temperatures can also easily cause herbicide damage. The optimal weed age is the 2-3 leaf stage, when weeds have a certain area to receive the herbicide and weed resistance is not high, so the weed control effect is significant. The optimal spraying time is after four or five o'clock in the evening, because when spraying at this time, the temperature after application is lower and the humidity is higher, the herbicide solution remains on the weed leaf surface for a longer time, and the weeds can fully absorb the herbicide components, ensuring the weed control effect. Evening application can also significantly improve the safety of corn seedlings and make herbicide damage less likely.
3. Scientific method of mixing the herbicide. Before use, the herbicide must be fully shaken well, and the two-stage dilution method should be used. First, use a little water with 100 milliliters of the original herbicide to make a mother solution, then add 25-30 kg of water, mix evenly, and then spray. For high-temperature and drought weather, the amount of spray solution should be increased, and the dosage should be appropriately increased to 125 milliliters. Be careful not to begrudge water while not begrudging herbicide.
4. Pay attention to sensitive varieties. For post-emergence corn herbicides containing nicosulfuron, such as Yunongle, varieties such as sweet corn and waxy corn are relatively sensitive to this component and are prone to herbicide damage, so they should be used with caution.
5. Pay attention to the problem of pesticide mixing. Within 7 days before and after spraying post-emergence herbicides containing nicosulfuron, it is strictly forbidden to spray organophosphorus insecticides, otherwise herbicide damage is likely to occur. However, they can be mixed and sprayed with pyrethroid and carbamate insecticides. When spraying, be careful to avoid the heart leaves as much as possible to prevent the solution from pouring into the heart.
6. After the 8-leaf stage of corn, for fields where chemical weed control was not carried out earlier or the application effect was poor and weed damage was not controlled, after the 10-leaf stage of corn, when the plant height exceeds 60 cm and the stem base has aged and turned purple, paraquat can be used with a protective shield for directed spraying. When spraying in a directed manner, be careful not to spray onto the corn stems and leaves to avoid herbicide damage.
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