The nutritional value of strawberries and cherries is very high, but because they are unsuitable for storage, the market price is low when they are listed in large numbers. The following briefly describes their storage methods for the reader's reference. I. Strawberry 1. Variety and Storage Characteristics Strawberries can be cultivated in both northern and southern China. The varieties that are more resistant to storage and transport include Jixin, Shitou, Gorera, Baojiaoshengsheng, Green Seeds, Brandonbao, Shuofeng, and Shuo Mi. Strawberry is a kind of non-respiratory morphing fruit. After harvesting, there is no post-harvest ripeness. After harvesting, the quality of flavour is good. The strawberry fruit is delicate, juicy, high in nutritional value, bright in color, pleasant in fragrance, and it is a kind of fruit with higher economic value. However, because it is a kind of berry, it has thin skin and no protective effect on the outer skin. It usually causes rot due to mechanical damage and pathogen infection during storage and storage. Botrytis cinerea is the main pathogen of strawberry rot. Strawberries are left in normal temperature for 1 to 2 days and they change color, taste, and rot, and the commodity rate drops rapidly. 2. Harvesting and Postharvest Treatment Strawberries used for storage and transport should be harvested when the fruit surface turns red at 3/4 because the strawberry has a higher hardness and good flavour quality. Picking is best done on a sunny day. Harvesting in the morning should be done after the dew is dry, and at high temperatures, avoid harvesting at noon. When harvesting, the fruit should be removed and the diseased fruit should be removed. The strawberries should be gently placed in a special dish. The size of the fruit plate is generally 90 cm, 60 cm, and 15 cm. It can also be placed in a small box with a hole of 20 cm, 15 cm and 10 cm. Inside. Strawberry should be pre-cooled in time. At present, the effect of vacuum precooling is the best. It can also be used for forced air cooling, but it is not suitable for water cooling. 3. Storage and Transportation Methods Strawberries can be stored for 1 week at 0°C and 90%-95% relative humidity. Although refrigeration can delay adverse changes in the fruits, strawberries are faster than unfrozen when they are removed from cold storage. . Since grass is a fruit with high carbon dioxide tolerance, storing and transporting in modified atmosphere can extend the post-harvest life of strawberries and reduce the decay caused by gray mold. However, the concentration of carbon dioxide cannot exceed 40%, otherwise the strawberry will produce odor. The suitable oxygen concentration for strawberries is 5% to 10%. When the carbon dioxide concentration reaches 30%, the strawberry will have some odor, but it will not be annoying, and it will disappear in the air. The controlled atmosphere storage period is 2 to 3 weeks. Strawberries are best transported in refrigerated trucks. For example, the use of a caravan can only be handled and handled during the early morning or early evening when the temperature is low. Small carton packs are used for transport, and it is advisable to fill the plastic film bags inside with 10% carbon dioxide. Second, the cherry Variety and possession of cherries There are many varieties of cherries, which have a long history in China. Cherry is ripe from April to May. The fruits are bright and beautiful, rich in nutrition, and high in iron content. They are most popular in spring and summer. However, the cherries are susceptible to overcooking, browning, and rot after harvest, and they lose their commodity value quickly at room temperature. China's main cherry varieties can be divided into Chinese cherry and sweet cherries. It is best to use sweet cherries for storage and export. Because of its high sugar content, the texture of the pulp is relatively hard and the fruits are large. Some of them are resistant to storage and transport, such as Nagung and bananas are the most resistant to storage and transportation, the day out and early red slightly resistant to storage and transportation. In general, early-maturing and medium-maturing varieties are not resistant to storage and transportation, and late-maturing varieties have a strong storage stability. Sour cherries are generally not used for long-term storage and are used for processing. 2. Harvesting, post-harvest treatment and quality issues The cherries used for storage should be properly harvested, usually harvested 1 week in advance, and harvested with fruit to avoid mechanical damage. Immediately after harvest, the fruits were precooled to 2°C and transported at a temperature not exceeding 2°C, basically controlling the decay caused by preharvest infestation of Mars disease. Because the cherry fruit is petite and not compressible, smaller packages should be used, 2-5 kg ​​per box. Big cherries are not processed properly after harvesting and are easily overripe and aging. When the humidity is too low and the temperature is too high, the fruit stems will wither and darken, the fruit will become soft, shrink, brown, and cause rot. The surface depression is the main problem affecting the quality of fresh sweet cherry. Post-harvest calcium treatment and decompression storage can reduce the incidence of surface depression. 3. Storage methods Cherries can be stored mechanically at -1°C to 0.5°C and 90% to 95% relative humidity for 20 to 30 days. The use of controlled atmosphere storage, especially simple and easy spontaneous atmosphere storage, can obtain better storage effect. The general practice is to line the 0.06 to 0.08 mm polyethylene film bag in a small box and store it at -1°C to 0.5°C to maintain the oxygen and carbon dioxide in the bag at 3% to 5% and 10%, respectively. % to 25%, so that the cherry can be stored for 30 to 50 days. It should be noted that the carbon dioxide concentration should not exceed 30%, otherwise it will cause browning and odor. In addition, in order to prevent bad odor, the polyethylene film bag must be opened after the fruit is removed from the cold storage.
The bearing structure, fixed film systems and installation of this greenhouse is relatively simple. And due to it, raw material and manufacturing costs are affordable. Except the high strength woven film is higher, other kinds of antidrop film are economical. In general, the comprehensive cost of film greenhouse is lower 30% ~ 50% than the same size and specifications of the other types of greenhouse.
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