The long-term harvest period has high temperatures, strong fruit respiration, rapid consumption of nutrients, large evaporation of water, rapid skin aging, and thin, juicy, high sugar content longan, which is vulnerable to mechanical damage and infectious bacteria. Therefore, it must be taken Comprehensive technical measures for harvesting and storage preservation. The methods are as follows: 1. Harvesting longan for storage is recommended to achieve eight to nine mature harvests, that is, when the pericarp is turned from blue to yellow-brown, and the fruit is changed from hard to soft and elastic, and the raw green taste disappears. . Fruit picking should be carried out in the morning or in the evening. Avoid picking fruit on rainy or windy days. When picking fruit, it usually takes 1 to 2 compound leaves, and don't use the base of the ear too deep. The longan fruits used for storage are often stored in full heads to increase the resistance to storage. 2. Antiseptic treatment The disease after longan fruit picking is mainly acid rot. It can be treated with Tecdo (0.05%) + imazalil (0.05%) for 2 to 3 minutes, and when adding fruits, 0.01% is added to the fungicide. The 2,4-d or gibberellin has good anti-corrosion effect. 3, pre-cooled longan harvest is in the summer and autumn, so pre-cooling is particularly important for longan preservation. There are many ways to pre-cool, you can use antiseptic treatment to dip medicine with ice water, or after the anti-corrosion treatment into the pre-cooling room for fruit packing, can also be quickly placed in the cold storage after packaging, first placed separately to dissipate heat Cool down and wait until storage temperature is higher. 4. Select fruit packaging Longan storage fruit should strictly remove the disease and fruit, mechanical injury, select the fruit with the same maturity, while removing the leaves and overlying spikes on the ear, so that the ear is neat. The inner package of longan should use a polyethylene or polypropylene bag with a thickness of 0.02 mm. The plastic bag is better than the plastic bag. Because the longan is thin and easy to be broken, the outer package should use plastic baskets, wooden boxes or foam boxes. 5. Storage and transportation 1 Normal temperature storage and transport of longan at room temperature The fruit is treated with preservation and then wrapped with polyethylene preservation film and placed in a polystyrene foam box or corrugated box. The box is filled with ice cubes and fruit ice. The ratio is 2-3:1. It can be stored and transported in a shed. It can be stored at room temperature for 7-8 days, and the good fruit rate is over 95%. 2 The temperature of low temperature storage longan after harvest is a key factor affecting the storage life of the fruit. Longan is sensitive to the storage temperature and is suitable for low temperature storage. Its storage temperature is 2-4°C. At the same time, the relative humidity of longan is required to be 85%-95%, the optimum gas ratio is 6%-8%, and the carbon dioxide concentration is 4%-6%. The longan is treated with preservative and pre-cooling, and is packaged with polyethylene film, placed in a suitable and relatively stable low temperature, spontaneously with low temperature and withered and stored for 35 to 40 days.
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