Using physical methods to preserve fresh cut flowers has the advantages of cost saving, ease of use, and technical simplicity. The technical points are briefly described as follows:
Cold preservation and low temperature can reduce cut flower breathing, reduce energy consumption, and inhibit the production of ethylene, thus delaying the old process. According to the experimental observation, at a humidity of 85% to 91% and temperature of 0°C, cut chrysanthemum can be preserved for 30 days, stored at 2°C for 14 days, and stored at 20°C to 25°C only for 7 days. Of course, different flowers have different storage temperatures. Generally speaking, the flowers that originate in temperate zones have a suitable refrigerating temperature of 0°C to 1°C; those originating in tropical and subtropical regions are 7°C to 15°C and 4°C to 7°C, suitable humidity is 90% to 95%.
Refrigerated moisture storage and dry storage: wet storage is to cut flowers in water or preservation solution for short-term storage, carnation, lily, gerbera, snapdragon, etc. can be stored in warm conditions for several weeks , but not commonly used in mass production. Dried storage is used for long-term storage of cut flowers. Generally speaking, carnations, chrysanthemums, etc. are stored for a longer time than wet storage and have good quality. In addition, dried cut flowers are often packaged in polyethylene film to reduce evaporation, reduce respiration rate, and extend life.
The method of controlled atmosphere storage and preservation is to control the carbon dioxide content of the oxygen glue in the cut flower storage place, achieve the reduction of the respiratory rate, reduce the nutrient consumption, and suppress the lean production so as to prolong the cut flower life. Due to different flower varieties, the carbon dioxide content is generally controlled at 0.35% to 10%, and the carbon dioxide content is between 0.5% and 1%, which can achieve good preservation effect. In addition, the input of nitrogen can also play a role in keeping fresh, daffodil in the nitrogen 10%, temperature 4.5 °C conditions, after 3 weeks storage is still bright, branches and tall and straight.
Antihypertensive storage uses special pressure storage chambers, which can delay the aging of cut flowers when the atmospheric pressure is reduced to standard atmospheric pressure. Compared with cut flowers under normal pressure, their life span is much longer. Tests have shown that T. candidum can be stored for 7 to 8 days at room temperature pressure of 0°C, but can store for 30 days at 60 mmHg, -2 to 1.7°C; rose can only be used under normal temperature and pressure conditions in summer. Stored for 4 days at 40 mmHg, 0°C for 42 days; Caryophyllus at 0°C for 3 weeks, and under low pressure for 8 weeks, freshness is reduced.
Radiant preservation with a certain beam irradiation cut flowers, can change its physiological activity, inhibit transpiration, delay cell senescence, thereby prolonging the cut flower life, someone with 2 to 10 Gray C60r rays irradiated rose, chrysanthemum, dahlia and other cut flowers, found that it cut flowers to keep fresh Have effect. After 10 Chinese Goose radiant rose cut flowers, the fresh-keeping rate reached 75% after 15 days of bottle insertion, and Dahlia was 60%.
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