Fresh vegetable preservation and storage

The edible part of the leeks is soft and tender. After harvest, it is susceptible to wilting, yellowing, and rot. It is difficult to keep fresh. And because leek is a perennial vegetable, the northern region grows at any time except in the winter withering, and can be harvested at any time. Therefore, the storage of leeks is rare. However, there are many cases of long-distance transport of leeks in China's winter railways, and the preservation technology in transportation is very important.

The primary condition for storage and transportation of leeks is low temperature, and low temperature has obvious effects on inhibiting yellowing and rot. The ideal temperature condition is around 0°C. In order to prevent the loosing of leeks, plastic films are needed. Cryogenic plus plastic film sealed packaging can also inhibit the respiration of leeks and reduce nutrient loss. However, at higher temperatures, plastic film sealing packages sometimes suffer from gas damage, manifested as dehydration in the tip of the leaves, causing odors. The way to prevent it is to avoid prolonged high temperatures, but also to make a few holes in the bag. According to the experiment, the fresh-keeping period of leeks packed in polyethylene bags with holes (8 holes with a diameter of 7 mm) is about 3 days at 20°C, 4-5 days at 10°C, and 11-12 days at 0°C. The fresh-keeping period of the non-porous 0.025 mm thick polyethylene bag sealed package is 20 days at 4-5 days, 10 days at 8-9 days, and 0 degrees at about 2 weeks.

0 °C low temperature and plastic bag sealed packaging measures is the ideal conditions for short-term storage and transport of leeks. However, at present, the actual process from harvest to consumption has not yet completed a perfect cold chain system. In particular, it is still difficult to achieve a low temperature of around 0°C during transportation and circulation. In this case, if it is a short-distance (6-12 hours) transportation, it can be used to quickly pre-cool after harvest, and then use the cold-car transport method can also receive better results.

In the winter of our country, from the south to the north, long-distance railway transportation of leeks is carried out, and the method of adding ice to the earth-removing vehicle is often used. First put the leeks into plastic bags and put them in bamboo baskets. Put some ice cubes in the center of the bamboo basket, between the plastic bag and the plastic bag. At the bottom of the Gao Bang Gondola, first lay a layer of ice about 33 cm thick. Place two tiers of raisins on the top, put a layer of ice on top, and lay another basket to make ice. Two layers of quilts are hung on the inside of the car lining, and they are lapped at the top and covered with a layer of quilts. This can be transported from south to north 7-10 days before the Spring Festival.

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