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Most of the chemical weeds used in the proper application of vegetable fields are soil-based, but they must be applied before or after sowing. The application time is best when the weeds are in the primary stage, when the weeds grow to 9-12 cm or during the tillering stage. After the application of the drug, the efficacy is poor or not effective at all. It is worth noting that after the soil treatment herbicide spraying, it will maintain a residual period of time in the soil, as long as more than a week is a year or more. This residual period will cause some late-growing vegetables to fail to germinate or germinate after germination. Sulfonylureas and imidazoline herbicides are strictly prohibited before vegetable plots. It is even more inappropriate to use Simazine and Fumeron that will poison soil.
Use herbicides with a short residue of life as much as possible depending on the variety of vegetables and the length of growth period. Generally, chemical herbicides with a suitable duration of persistence should be selected to reduce pesticide residue contamination and harm to post-harvest vegetables. Attention should be paid to chemical herbicides. The special sensitivity to vegetables, such as cucumber, lettuce is sensitive to prometryn, trifluralin; celery, carrots are sensitive to Napropamide; leek, green onions and other Liliaceae vegetables and spinach are sensitive to herbicide ether, but also for the former The field of these herbicides is also very sensitive, and care should be taken when using them to avoid the application and jointing.
Pay attention to the timing of the drug Chloride, napropamide, herbicidal ether, prometryn, Shi Tianbu are all soil treatment agents, mainly through the weeds of young roots and shoots to absorb the effect, inhibit the growth of weeds, generally in the crop Pre-emergence or pre-planting application. The herbicides treated on the stems and leaves are absorbed by the stems and leaves of the weeds to destroy the splitting tissues in the plants, and the application time should be appropriate during the period of 3-6 leaves of grasses.
Pay attention to dosage forms In general, vegetable fields should avoid the use of herbicides such as emulsifiable concentrates, suspensions, smokers and tablets to prevent direct or indirect injury to vegetables.
In the facility cultivation area, reducing the use of drugs to protect vegetables grown in protected areas, the indoor temperature and soil temperature in the shed are high, the humidity is high, and the efficacy is fast. The amount of pesticides used should also be reduced by 20% to 30% compared to the conventional open field cultivation of vegetable fields. %, so as not to cause a large area of ​​phytotoxicity to vegetables in greenhouses.
Herbicides are used in vegetable fields
With the continuous expansion of vegetable acreage, control of weeds is a more intractable problem. According to observations, weeding and weeding often account for about 30% to 40% of the entire farm management workforce. The use of chemical weed control not only can prevent weeds in the vegetable field, but also can save the weeding labor and reduce the labor intensity of vegetable farmers, but the following problems must be paid attention to when using herbicides.