How to shade the greenhouse in summer vegetable greenhouses
Greenhouse cooling agent is not ripe to choose carefully
Compared with covering shade nets, splashing mud, ink jet juice, etc., greenhouse temperature-reducing agents do not cool light by blocking part of the light, but block light components such as infrared rays (infrared rays have no effect on photosynthesis of plants, but can significantly improve the shed Internal temperature) to achieve cooling, not only has a significant cooling effect, but also ensure that plants have sufficient light for photosynthesis. When using the greenhouse temperature-reducing agent, the light-shielding rate can be relatively accurately calculated and determined according to the light-requiring characteristics of the vegetables to be grown, thereby creating a light environment conducive to the growth of the vegetables.
In foreign countries, greenhouse temperature-reducing agents have been widely used in agricultural facilities for facilities due to their advantages of economy, efficiency, ease of use, and good results. In recent years, some foreign companies and domestic companies that have introduced foreign technologies have also begun to test and popularize greenhouse gas cooling agents in China. However, according to many vegetable farmers who have used large greenhouse temperature-control agents, the effect of use of greenhouse cooling agents has not been as good as they thought. This is because the insulation materials of the greenhouses in the foreign countries mainly use long-lasting and fixed-shape light-transmissive materials such as glass. However, the plastic materials used in China are mostly short-lasting and soft-material plastic films. These two types of materials There are obvious differences between them, and their adhesiveness, shading, and cooling are not the same. Therefore, we must remind vegetable farmers that we should be cautious when selecting new products such as greenhouse cooling agents. It is best to do a one-year observation and test with the help of manufacturers or dealers. After fully understanding the characteristics of the greenhouse cooling agent and the use of technology use.
Cooling in technical aspects is also important
At present, many vegetable farmers only use a single method of cooling the sun, but do not cooperate with the corresponding technical links. The actual cooling effect is not good. In this regard, the author suggests that: while using the method of shading and cooling, we must cooperate with scientific management methods such as correct ventilation and accurate moisturizing.
Increase ventilation: Increase ventilation is a key measure to reduce temperature. When ventilating, it is necessary not only to open the tuyere at the top of the greenhouse, but also to roll up the film on the front of the greenhouse. However, it is necessary to cover the insect nets at the same time as ventilation to prevent pests from moving into the shed. Arch shed management with a shed.
The lower leaves of the plants are not removed: When the vegetables are cultivated in winter, the purpose of removing the lower leaves of the plants is to enhance field permeability, increase the temperature of the ground, and control the occurrence of diseases. However, when the vegetables are cultivated in summer, due to high temperature and long illumination time, the measures taken to pick up the leaves are likely to cause the ground temperature to be too high, while the high ground temperature not only affects the normal growth and development of the roots, but also causes the gas due to the intense microbial activity in the soil. harm. The removal of the lower leaves of the plants may play a role of shading and cooling, so that the ground temperature is relatively stable and will not be too high.
Keeping the fields moist: Some vegetables are not as tolerant to drought as they are wet, so a high-humidity environment is more beneficial to their growth. Stingless cucumbers require high soil moisture and air humidity. The appropriate air humidity is 70% to 90%, and the soil moisture requirement is 85% to 95%. At the same time, in the case of high humidity, the temperature increase is small, which can play a role in lowering the temperature. The measure to keep the field moist is to water the plant in time and dilute it with diligence, but do not allow water to accumulate in the field. Of course, diligence and ground irrigation should be based on the strong permeability of the soil. If the soil is compacted, it is necessary to use a small amount of water to control the temperature.
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