Application of comprehensive storage, transportati

2022-08-17
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Application of comprehensive storage, transportation and fresh-keeping technology of vegetables (Part 1)

in order to squeeze the extruded material to a certain level by hand without showing burrs and cracks, the storage, transportation and fresh-keeping of good vegetables must pay attention to the pre harvest and post harvest factors, and ignore any kind of factors, and the storage, transportation and fresh-keeping cannot be successful. In the process of storage and transportation, people often ignore the influence of pre harvest factors, resulting in the failure of storage and transportation. Because pre harvest factors directly determine the quality of stored and transported products and the quality of supply. The control of post harvest factors directly determines the effect of preservation (anti-aging) and preservation. Some post harvest control measures can not only keep fresh (act on products, prevent aging), but also prevent corrosion (act on microorganisms, inhibit the growth and reproduction of microorganisms); Other post harvest control measures only have a fresh-keeping effect (on products), or only have a preservative effect (on microorganisms). Over ripening, aging and decay of products are closely related, so preservation and preservation cannot be completely separated. Therefore, in order to do a good job in the storage, transportation and preservation of vegetables, we must pay comprehensive attention to the pre harvest and post harvest factors. The specific approach is to select high-quality products, pay attention to the two key issues of fresh-keeping and anti-corrosion, and take corresponding technical measures

I. pre harvest and post harvest factors and the storage resistance and disease resistance of vegetables

the storage resistance of vegetables refers to a characteristic that delays the changes of their own morphology, flavor, quality and nutrients during storage. The disease resistance of vegetables refers to the resistance of vegetables to pathogenic microorganisms. There is a close relationship between disease resistance and storage resistance

generally speaking; Vegetables with strong storage resistance also have strong resistance to diseases; Conversely, vegetables with weak disease resistance are generally not resistant to storage. Pre harvest factors have a great influence on the storage resistance and disease resistance of vegetables. The physiological characteristics of vegetables after harvest, including storage resistance and disease resistance, are formed under field growth conditions. Undoubtedly, the growth characteristics, field climate, soil conditions and management measures of different vegetables will have a direct or indirect impact on the quality and storage characteristics of vegetables. Therefore, if we only focus on the technical links in the storage or circulation process and ignore the prerequisite of field growth factors, it may also lead to serious losses. Because only normal physiological conditions and intact vegetables have real value for storage. Growth conditions not only affect the product quality, storage resistance and disease resistance of vegetables, but also affect the number of pathogenic microorganisms attached or latent on the surface of products, which is also an important factor related to storage. Pre harvest factors include biological factors, ecological factors, agricultural technology factors, etc. The influence of agricultural technology on fruits and vegetables is similar to that of ecological factors. They mainly determine the degree of established genetic expression of fruits and vegetables. Good storage materials should be the combination of high-quality fruit and vegetable varieties with storage resistance and reasonable agricultural technology, that is, the combination of improved varieties and methods, in order to obtain ideal products for storage. Postharvest factors also have a great impact on the storage resistance and disease resistance of vegetables. Only by maintaining the slow life activities of the vegetable body and delaying the decay of its storage resistance and disease resistance can it be possible to extend the storage life. During the storage of fruits and vegetables, we should also control the environmental conditions, and control the development and changes of storage resistance and disease resistance by controlling the environmental conditions, including: ① control the low temperature suitable for the gradual increase of military attention; ② Control appropriate humidity; ③ Control appropriate gas composition; ④ Prevent mechanical injury; ⑤ Use preservative treatment, etc. Selecting good varieties and reasonable cultivation can obtain products with good storage resistance and disease resistance, which is the internal basis of storage. Then, during storage, control the storage environmental conditions at the most appropriate level, and delay the decay of storage resistance and disease resistance as much as possible. In this way, it is possible to complete the task of vegetable storage

II. Comprehensive storage and transportation and fresh-keeping technology of vegetables

(I) pre harvest factors

1. Biological factors include species and varieties, rootstocks, field growth status, maturity, etc_

2. Ecological factors of vegetables include temperature, light, moisture, soil and geographical factors, such as longitude and latitude, terrain, altitude, etc.

3. Agricultural technology factors include fertilization, irrigation, plastic pruning, flower and fruit thinning, the use of chemical agents, etc

(II) direct and important pre harvest factors

1. Select suitable varieties that can be stored and transported in this way

2. Maturity each variety has its own suitable maturity for storage and transportation. If the frequency band is too narrow, the storage resistance and disease resistance of the product will be reduced

3. season and frost products in late autumn and before frost are resistant to storage and transportation, while products affected by frost are not resistant to storage and transportation

4. Special attention should be paid to pre harvest pest control and yield limitation in field disease management and yield limitation

5. Irrigation and rain stress that irrigation should be stopped 5-7 days before harvest, and rainy days cannot be harvested, and rainy products cannot be stored

(to be continued)

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