Planting time of celery in greenhouse Key points of tomato-tomato-celery continuous cropping cultivation technology in greenhouse

In recent years, some towns and villages in Luannan County began to popularize the cultivation technology of tomato-tomato-celery continuous cropping in greenhouse. After several years of cultivation practice, good economic benefits have been achieved. In 2008, the average economic benefit of each greenhouse (net area of 0.6-0.7 mu) reached more than10.2 million yuan, and the highest was10.6 million yuan. In order to popularize this planting mode, the technical points are introduced as follows:

The first tomatoes in winter and spring

1. Suitable varieties: American No.4, Xinmi

2. Seedling raising time:165438+1late October-65438+early February, sowing in mid-February.

3. Fertilization and soil preparation: 5000-8000 kg of organic fertilizer, 30 kg of diammonium, 20 kg of potassium sulfate and 2 kg of trace fertilizer are applied per mu. After fertilization, the soil is deeply ploughed for 30cm, and after leveling, it is made into 10cm high border, 100cm wide border, and covered with plastic film.

4. Planting time: it should be planted in mid-February, and it should be carried out in sunny weather, with a density of about 5,000 plants per mu.

5. Field management: after planting, keep the temperature high, and uncover the grass cover at night and cover it early. The temperature of the shed is 30-32℃ during the day and 18-20℃ at night. After planting for 7 days, water the seedlings once. After the heart leaves begin to grow, the temperature should be lowered appropriately and the temperature difference between day and night should be increased. The straw cover should be uncovered early and covered late to promote the healthy growth of seedlings and avoid squatting. When more than 50% plants bloom, timely protect flowers and promote fruit; When the diameter of the first ear fruit reaches 2 cm, water and topdressing in time, and topdressing urea 10 kg per mu. Prune single stem, fork thin fruit in time, leave 3 ears of fruit to the top of each branch, 3-4 grains per ear, water the whole plant for the second time after fruit setting, apply urea 15kg per mu, and pay attention to strengthening pest control.

6. Timely harvesting: harvesting begins in mid-April of the following year, and seedlings are pulled out in mid-May.

Second, tomatoes in the second summer

1. Suitable variety: 1857, Mei Wen.

2. Seedling raising time: sow in early May and late June, and the seedling age is about 55d.

3. Fertilization and soil preparation: 3000-5000 kg of organic fertilizer, 25 kg of diammonium in the United States, 0/5 kg of potassium sulfate/kloc and 2 kg of trace fertilizer are applied per mu. After fertilization, the soil was deeply ploughed by 30cm, leveled and made into ridges with a height of 100cm and a width of 100cm, and covered with plastic film.

4. Planting time: planting in late June, with a density of about 4,500 plants per mu.

5. Management technology: After planting, the weather is hot. Open the upper and lower vents on sunny days. When the room temperature reaches 30℃, shading net is used to shade the sun (shading time is generally11:00-15: 00), and 10cm straw is laid in the border to reduce the ground temperature. Close the vent in rainy days to prevent rainwater from entering the room. The temperature is maintained at 25-30℃ during the day and 16-20℃ at night, and the humidity is controlled at 50%-65%. Prune with single stem, water 1 water for 3-5 days in sunny days and 1 water for 7- 10 days in rainy days before fruit setting after seedling extension, and flood irrigation is prohibited. Watering should be done at night or in the morning. When the second panicle begins to swell, water 1 time is applied for 5-7 days, and combined with watering, compound fertilizer with nitrogen, phosphorus and potassium content of15:15 is applied for 30-35 kg/mu, and potash fertilizer 10 kg is applied for each time. Every 7- 10 days, foliar topdressing 1 time, 0.3% potassium dihydrogen phosphate and poly-2 can be sprayed to meet the needs of fruit setting and fruit expansion. When the third ear fruit sets, leave 2-3 leaves for coring, and all the side branches are knocked out. Sparse flowers to protect fruits, water the day before spraying flowers, and then spray flowers with 30-40mg/kg tomato essence aqueous solution to keep stigma moist and improve fruit setting rate. In order to improve the commodity rate, 3-4 fruits should be left in the first ear, 4-5 fruits should be left in the second and third ears, and redundant flowers should be thinned out, especially the small flowers in the first and top Kobanawa. Avoid large and small fruits and deformed fruits.

6. Timely harvesting: harvesting will be started in late August, and seedlings will be pulled out in early September.

Third, the third autumn and winter celery

1. Suitable variety: Celery scab.

2. Sowing time: Sow seedlings in mid-July, sow in mid-September, and cultivate in the flat border.

3. Fertilization and soil preparation: 5,000-8,000 kilograms of organic fertilizer, 20 grams of diammonium phosphate or 0/00 gram of calcium superphosphate/kloc, and 20 grams of urea are applied to each mu of border. After deep ploughing, a frame was made, with a width of 1m and a length close to the span of the greenhouse. Border irrigation at seedling stage 1-2 days before sowing.

4. Planting time: planting in mid-September. When planting seedlings, dig out celery seedlings one by one with a sharp shovel, shake off the soil, do not cut roots, do not pinch leaves, pottery pests and diseases will harm seedlings and weaken seedlings. And plant the big and small seedlings separately. 1m width border planting 6 rows, one plant, the spacing between plants is 8cm, and the number of seedlings per mu is 50,000. Plant the stretched root system in the ditch, and the planting depth shall be based on the length of the seedling root system. Don't bury it in your heart. Too deep or too shallow is not good. After planting, you can water it in the border, or you can water it in rows when planting.

5. Management technology: Because the temperature is still high, there is plenty of sunshine during this period, and the soil evaporation is relatively large. On the basis of sufficient water for planting, water should be poured twice continuously 2-3 days after planting to promote the occurrence of new roots and carefully loosen the soil and moisturize. After rain and irrigation, loosen the soil in time to promote root development and prevent the overground part from growing white.

(1) temperature management: cover with plastic film before frost. After that, we should strengthen ventilation to prevent the temperature from being too high. Expose the front foot more than 60cm, and open an air outlet in each room of the back wall to release convective air. When the outside temperature drops or there is a cold wave, the air outlet of the back wall will be closed and blocked, and the front foot will continue to ventilate. As the weather turns cold, the outdoor time is gradually shortened and the outdoor air volume is gradually reduced. Outdoor air is based on the temperature in the greenhouse. The suitable temperature for celery growth is 15-20℃, so outdoor air is released when it exceeds 20℃ and closed when it is lower than 15℃. When the outdoor temperature is below 10℃, put down the apron. When the temperature drops to 6-8℃, cover with grass and paper at night.

In the cold winter, we should do everything possible to increase the light, strengthen the heat preservation, uncover the plastic film in the morning, and when the indoor temperature does not drop, it is the best time to uncover the grass film, and then cover it in the afternoon when the plastic film begins to freeze. The temperature should be above 2℃ at night, so as not to catch a cold.

(2) Fertilizer and water management: The plant height of celery at the first topdressing was 15cm. Topdressing soybean cake150g and urea 25g per square meter, or topdressing human excrement and urine with water mu. When applying chemical fertilizer, you should spread it at noon when the dew clears, sweep the leaves with a new broom, and water them while chasing, so that the water overflows the leaf center at the border to prevent the falling chemical fertilizer from burning the leaf center and growing point. Always let out the wind after watering. After that, keep the boundary moist. When the celery plant height 15-20cm, 30-50mg/kg gibberellin should be sprayed, and 200-300 times of urea should be added, and then sprayed again after half a month. One month after the first topdressing, the second topdressing was carried out, and urea was dissolved in water and poured into the border or sprinkled with water, with the same dosage as the first topdressing. In severe winter, the indoor wet room is too large, and the plant water transpiration is small. Therefore, the irrigation frequency and quantity should be reduced as much as possible to prevent diseases.

6. Timely harvesting: celery harvesting generally lasts from mid-June165438+1October to the end of June of the following year. Take the way of assembly and go public in stages. Celery must be harvested in time, and the highest yield cannot be achieved by harvesting it too early. The nutrients in the petiole are transferred to the roots when the harvest is too late, which makes the petiole loose and hollow, thus reducing the quality and yield.