I. Selection of Herbicide
1. Seedling stage
At this stage of seedling raising, celery is very resistant to drugs because it has not been exposed to any drugs, so it needs to choose some efficient drugs to have certain effects. At this time, there are many drugs to choose from, such as evil land, high-efficiency flufenoxuron, trifluralin and so on.
2. Growth period
There are many drugs suitable for the whole growth period. Generally, when celery has 3~5 leaves, drugs can be used, such as 5% quizalofop-ethyl EC, 12% clethodim EC, etc.
Second, the use of herbicides.
1. Seedling stage
Pay attention to the proportion of drugs used at this stage. Generally, 48% trifluoling is used per mu before emergence, and 48% Diluoling can also be used. These drugs can be sprayed in the soil. 35% herbicide can be used after emergence, and the resistance is relatively strong at this stage. However, because the seedlings have just been unearthed, it is easy to produce phytotoxicity, so we must pay attention to the proportion of drugs used.
2. Growth period
Choose 5% quizalofop-ethyl EC 40-60ml or 12% clethodim EC 35-40ml/ mu. These drugs must be diluted with water, added with 30~40 kilograms of water, and then sprayed in these proportions. If there is more grass, you can appropriately increase the use of drugs.
Third, matters needing attention
1. Reasonable choice
There are many kinds of herbicides suitable for celery. No matter what type of herbicide you choose, you should know the instructions in detail before using it. You should read carefully, understand the content and what crops you are suitable for growing. In addition, it is necessary to know the taboo, concentration and usage of this pesticide in order to use it correctly and avoid the occurrence of phytotoxicity.
Correct use
In the process of using herbicides, it is necessary to ensure that the soil has enough water and water absorption, and pesticides should be used before sowing or before emergence after sowing. If you want to make herbicides more effective, you can use them before weeds grow. If celery has been covered with plastic film, the proportion of medicine used can be reduced appropriately, generally 20% less than that planted in the open field.
Pay attention to the weather: in order to avoid hurting other crops, we must pay attention to the windy weather without spraying drugs, and choose sunny and windless weather.
3. Avoid drug injuries
After using herbicides, it is necessary to observe whether crops are harmed by drugs. If phytotoxicity occurs in a short time, it can be recovered by itself, but if phytotoxicity is serious, celery should be recovered with active liquid fertilizer.
4. Spray medical equipment cleaning
The residual liquid must be discharged every time the herbicide is sprayed. It needs to be washed with alkali water for 2-3 times, and then washed with clear water. The reason for this is to avoid the need for other crops to use drugs next time.