Good benefit of overwintering cultivation techniques of pollution-free celery

Greenhouse celery

In Hetao area, greenhouse is generally only used for overwintering cultivation. The seedlings were raised at the beginning of July, planted at the beginning of September, and the stubble was cleared from March to April of the second year. Because the growing period of this crop of celery is too long, not only after hot dog days, but also after three or nine cold days, therefore, it is necessary to choose solid stalk celery which is not only heat-resistant, cold-resistant, winter-resistant, not easy to bolting fiber, crisp and tender in quality, and green in petiole. Judging from the market consumption in recent years, celery and celery each account for 50%.

1. Planting in greenhouse: it is usually finished from late September to before frost. If you can't get stubble for a while, you can put the celery seedlings out and fake them in the greenhouse to prevent the cold. Soil preparation and border application of basic fertilizer: after plucking seedlings in the previous crop, remove residual weeds, prepare the soil, make beds, and apply base fertilizer in the same way as greenhouse celery. Planting: eliminate diseases and insect pests and weak seedlings, and plant seedlings of the same size together. Each bed is planted with 5 lines and 6 rows, a single plant with a distance of 8 cm, and the seedlings will be watered immediately after planting.

2. Management in the greenhouse: on the basis of pouring enough planting water, and then continuously irrigating once or twice, it is necessary to carefully loosen the soil and preserve soil moisture. In the early stage, it is necessary to increase the amount of air release, release convection wind, release night wind, increase the temperature difference between day and night, properly control moisture, promote the development of root system, short petiole, thick stem, accumulate more nutrients, and lay the foundation for the inner layer to grow into thick petiole.

3. Strengthen fertilizer and water in the middle stage: when the inner leaves begin to grow vigorously, start to fertilize and irrigate, topdressing ammonium nitrate 40ml 50g per square meter, irrigating while chasing, and strengthening ventilation after irrigation.

4. Heat preservation and cold protection in the later stage: as the weather turns cold, no more than 25 ℃ during the day, heat preservation should be strengthened at night. After entering the winter, grass curtains should be added, soil should be cultivated outside the back wall and indoor temperature should be heated to reduce irrigation to prevent diseases.

5. Pest control: the main diseases and insect pests of celery are spot blight, spot disease and aphids: the residual leaves of diseased plants should be removed in time when finding spot blight, and sprayed with 72.2% Pulick EC 600 times and 72% Kelou wettable powder 500ml 600 times. For the prevention and control of celery spot disease, the first is to strengthen management, increase the application of organic fertilizer, prevent drought and waterlogging, avoid irrigation at high temperature, and irrigation well water after rainstorm; the second is to use chemical control, which can spray 75% chlorothalonil wettable powder 500ml 800 times liquid; you can also use 50% carbendazim wettable powder 500ml 600 times liquid spray. Aphids were sprayed with 2000 times of imidacloprid wettable powder and 4.5% of cypermethrin 1500 times.