How to place celery without turning yellow?

1. The frozen storage of celery varies from place to place. Shandong Weifang has rich experience, large storage capacity and good effect. In addition to local supply, it is also sold in large quantities to other places every year. Liaoning Lvda, Yingkou and other places combined with local climate conditions, changed Weifang's above-ground frozen storage pit into semi-underground frozen storage pit, widened the wall thickness to 85cm, and thickened the soil to 30cm in the coldest weather, and achieved good results. Frozen celery can be thawed and eaten as spinach. Or 5-6 days before leaving the cellar, pull out the shadow barrier on the south side and change it into the wind barrier on the north side (the barrier ditch dug in advance when building the cellar), fasten the glass window on the cellar surface or cover it with plastic film, shovel off a layer of frozen soil, leave the last layer of thin soil to protect the celery below, and slowly thaw it. 2. In Beijing, Taiyuan, Tianjin, Liaoning and other places, celery was stored by following method, and the effect was good. The width and depth of heel in ditches are about 0.7- 1.5m, and the length is not limited. Dig the celery and root it, plant it in the heel in the ditch, and then water the roots, which can be irrigated 1 ~ 2 times according to the wet and dry conditions of the soil. In order to facilitate ventilation and heat dissipation in the ditch, a bunch of straw should be placed horizontally between celery every 1m or vertical ventilation pipes should be dug at a certain distance on both sides of the ditch. After celery enters the ditch, cover it with a straw curtain, or cover it with a shed at the top of the ditch and cover it with soil, leaving vents as appropriate. Later, as the temperature drops, the hood will thicken and the ventilation channel will be blocked. During the whole storage period, keep the trench temperature at 0℃ or slightly higher to avoid heating or freezing. 3. It is generally believed that 2%-3% oxygen and 4%-5% carbon dioxide can significantly inhibit the degradation of chlorophyll and protein during celery storage, and effectively maintain the storage quality of celery. The storage temperature should be 0-65438 0℃ and the relative humidity should be 90%-95%. Yangji Vegetable Store of Shenyang Vegetable Company (1984) uses plastic film bags and small packages to store celery in cold storage. After the celery is harvested, it is transported to the cold storage for processing and selection in time. Cut off the long roots about 2cm, remove the yellow leaves and damaged leaves, bundle healthy plants with normal color into small bundles of 0.5- 1.0 kg, and put them in the warehouse shelves for precooling 1-2 days and nights. When the temperature of vegetables drops to 0℃, the vegetables are put into polyethylene film bags with the thickness of 0.07-0.08 mm, the length of100-10 cm and the width of 75 cm (natural width), and each bag is13-15 kg. Then put the bags on the vegetable rack and don't squeeze each other. Generally, it is stored in the same warehouse number with young garlic shoots, and the warehouse temperature is kept at 0- 1℃. After 50-60 days of storage, if the leaves are found to have Yellowstone (or rot), they should be treated and trimmed in time. Under normal circumstances, the commodity rate reaches about 90% after being stored for 3 months, and spinach and coriander also have the same effect. 4. Plant hormone treatment has been reported at home and abroad, and plant hormones such as GA and BA can delay leaf senescence. Shenyang Agricultural University (1990) treated celery with plant hormones, and the effect of GA (30-50mg/L) was better. The experimental village is celery in greenhouse (1harvested in early October, 165438+), which is sprayed in the field 0-2 days before harvesting or indoors from the second day after harvesting, dried to remove water droplets, and precooled until it meets the requirements, then put it into a thin film bag and loosen the bag mouth. After storage at 0℃ for 3 months, the commodity rate reached more than 95%, while the control was only about 80%. * * * Efficient and comprehensive storage and fresh-keeping technology of autumn celery * * * Celery is rich in minerals, vitamins and other nutrients, and its roots and leaves can be used to extract spices. Celery has the functions of lowering blood pressure, promoting blood circulation, strengthening brain, clearing bowel and relaxing bowels, and is one of people's favorite vegetables. Its nature is cool and humid. In the past, the cold storage temperature was too low and the roots were frostbitten. After thawing, they can't be restored to a fresh state. Therefore, on the basis of summarizing the traditional experience of "cold storage" of autumn celery, we have carried out the micro-freezing storage test of celery for many years and summarized a set of more scientific storage methods. Comprehensive technical measures, such as chemical control, low temperature (-2-3℃), poor light, respiratory inhibition and dormancy promotion, were taken to make celery stored in the cellar for 3 months without yellow leaves, yellow stems and rotten leaves. The fresh-keeping rate reached 100%. Under these conditions, the degradation of chlorophyll and protein during celery storage could be inhibited, and the net income of 666.7m2 celery stored in cellar increased by 2345 yuan, with remarkable synergistic effect. It has been extended to 166h2 only in the surrounding areas of Fangzhen, and the net income of vegetable farmers is more than 5.68 million yuan. The comprehensive technology of storage and preservation of autumn celery is introduced as follows: the main technical measures are 1. Select improved varieties. Select the excellent celery variety "Dabaigen" which enjoys high reputation both inside and outside the province. Its stems and leaves are green in color, crisp, fragrant, delicious, high in yield, good in quality and good in commodity. Baimiao celery in Tianjin and Banger celery in Beijing are excellent varieties with strong cold resistance and storage resistance. 2. Sow at the right time. After years of practice, it is appropriate to raise seedlings in early July and transplant seedlings in mid-August, with 45,000-50,000 plants //666.7m2. 3. A suitable collection. Water the celery before harvesting. When the celery field is wet and dry alternately, lift the celery by roots to remove yellow, dry oranges and rotten leaves. Celery with bright green stems, strong growth, no plant diseases and insect pests and no freezing injury is selected and harvested 3-4 days before and after beginning of winter. The harvesting time should be appropriately advanced, and it should be bundled into 5- 10 kg bundles along with harvesting and processing, and stored in the cellar. Premature high temperature is not conducive to storage, otherwise it will be frozen before harvesting and reduce the quality. 4. Spray gibberellin (920) skillfully. Practice has proved that this is also one of the key measures to improve celery yield, cellar preservation and commodity rate. Spraying 50PPM of "920" for the first time before harvesting on 15-20 days can increase the yield of celery by 15%-20% and make celery grow healthily. Watering and spraying 70 ppm of "920" 2-3 days before celery harvest again inhibited the respiratory consumption of celery in low temperature and weak light, which was beneficial to the preservation of celery in the cellar and prolonged the storage period. Compared with celery without spraying "920", the preservation rate reached 100% after 2-3 months delay. 5. Build a cellar. Choose a cool and ventilated place or a place with high terrain where water is not easy to accumulate. The size of the cellar depends on the storage capacity of celery, generally 25m long and 2.5m wide. The periphery of the cellar wall is compacted with plywood, with a thickness of 0.2m and a height of1.3m. Every 0.8m, a vent with a height of 0. 15m and a width of 0. 1m is left. The walls of the basement. Pit temperature control. Celery entered the cellar around beginning of winter. At the beginning of the cellar, the straw curtain was covered during the day, and it was taken down at night and placed outside the north wall for "frosting" and then covered the next day. The temperature difference between day and night is gradually widening. It is appropriate to control the temperature in the cellar with the change of air temperature, and it is appropriate to control it between -2 ~ 3℃. The main measure is to uncover the plastic sheet at the top of the cellar at night to cool down, then cover it during the day and cover it with a straw curtain to isolate the introduction of hot air. When the temperature is too high, a shade shed can be set up on the south side of the cellar to control the frost between celery leaves, and light frost on the cellar wall is appropriate. During the period from heavy snow to winter solstice, as the temperature drops, the ventilation crossing should be strictly blocked, and a layer of wheat grains or other firewood should be added at the top of the cellar to keep the temperature in the cellar, so as not to cause celery to be hot or frozen. Through the transformation of the cellar wall, it was increased from the original 0.8m to about 1.3m, which was 0.4-0.5m higher than that of celery, so that the upper space of celery could adjust the temperature fluctuation and resist extreme temperature changes. 15- Spraying "920" with different concentrations twice 20 days and 2-3 days before harvest increased the yield of celery and enhanced its storability. Through scientific management, the temperature in the cellar is controlled between -2-3℃. Celery has been in a dormant state, not hurting heat or freezing.