Post-emergence management techniques for celery.
1. Field management.
When the celery seedling rate reaches 70%, the mulch film should be removed to prevent growth. After removing the film, tillage, loosening soil, weeding 2-3 times, while topdressing seedling fertilizer, 10-15 kg of ammonium sulfate per mu, or urea 75-10 kg. After fertilization, water a large amount of water once, and then water a small amount of water frequently to keep the ground moist to reduce the ground temperature and promote the growth of celery. When the seedlings grow to 2 and 4 true leaves, the seedlings are thinned and weeded once each, and the seedling spacing is 4-5 cm.
2. Fertilizer and water management.
Celery needs to keep the soil moist after emergence to promote seedling growth. During the growth of celery, it is necessary to top dressing at the right time. When the seedlings grow to 2-3 true leaves, nitrogen fertilizer can be topdressed, using 10-15 kg of ammonium sulfate or 75-10 kg of urea. Watering should be done immediately after top dressing so that the fertilizer can penetrate into the soil. During celery growth, it is necessary to keep the soil moist and pay attention to weeding and thinning.
3. Pest control.
Celery can be attacked by pests and diseases during its growth. Among them, common diseases include spot blight, soft rot, etc., and common insect pests include aphids, spotted submarine flies, etc. In order to effectively control these pests and diseases, a series of control measures are required. First of all, field management should be strengthened, the countryside should be kept clean, and the sick and disabled bodies should be removed in a timely manner. Secondly, the method of pharmaceutical prevention and control can be adopted. For diseases, an appropriate amount of Bordeaux liquid, chlorothalonil, methyl tobuzin and other agents can be used for spray control;For insect pests, an appropriate amount of imidacloprid, trichlorfon, kung fu and other agents can be used for spray control. In the process of pesticide control, attention should be paid to the concentration of pesticide and spraying method to avoid pesticide damage to celery.
4. Harvesting and storage.
The harvest period of celery is generally 100-150 days after sowing, and it can be harvested when it grows to a height of 50-60 cm. Before harvesting, the dead leaves and weeds in the field should be removed, and then the celery should be cut from the roots, the yellow leaves and rotten leaves should be removed, and the yellow leaves and rotten leaves should be bundled and sold. If storage is required, bundled celery should be stored in a cool and ventilated place, and checked regularly to prevent rot and pest and disease infestation. During storage, attention should be paid to maintaining the appropriate temperature and humidity to avoid high and low or too high and too low.
In conclusion, the management techniques of celery after emergence include field management, fertilizer and water management, pest control, and harvesting and storage. In order to improve the yield and quality of celery, efforts need to be made in these areas. At the same time, we should pay attention to the impact of environmental factors such as weather changes and soil conditions on the growth of celery, and take corresponding countermeasures.