Covering the shading nets should pay special attention to two issues

One is the question of how long the sunshade network covers and covers. Covering the shade net requires a flexible grasp of the light intensity and temperature requirements according to the weather conditions, the type of vegetables, and the stage of vegetable growth. Generally sunny cover, cloudy exposing; noon cover, sooner or later, exposing; pre-covered, late exposing. If there is more rainy weather and the temperature is not too high, after the vegetable is planted, the shade net can only be covered in the gentle seedling period, and the black shade net is covered only at noon on sunny days during the slender season. Sunshade net cover for a long time will affect the photosynthesis of vegetables and is not conducive to the normal results of vegetables. General shade nets are used only during the brightest periods of the sunny day at noon, and their specific coverage time is from 10:30 am to 2:30 pm. If the shade net can still not lower the temperature, spray water or irrigation can be used to reduce the temperature. In addition, the spraying of 0.1% zinc sulfate or copper sulfate solution can enhance the ability of plants to resist cracking and sunburn. The second problem is to isolate the shading net and the shed film when covering. The shade net clings to the shed film, the heat that it absorbs is very easy to spread to the shed through the shed film, cannot reduce the shed temperature well. Moreover, the shade net clings to the shed film, because the heat cannot be dissipated, resulting in an increase in the temperature of the shade net itself, which will accelerate the aging of the shade net. Therefore, when covering the shading net, two laminating soil bags should be placed on the bamboo raft at a certain distance. The shed front can be placed at a certain distance and put away the abandoned grass raft. The purpose is to make the shading net not adhere to the shed film. Splashing mud or ink jet shade cooling has both advantages and disadvantages.

Spraying mud or inkjet juice onto the film is a way of reducing the amount of heat that the vegetable grower has made in production. The mud is poured into a bucket filled with water and shaken, then splashed on the shed. The ink-jet juice sprays ink on the greenhouse. These methods are simple, fast, and cost-effective, and can effectively alleviate the adverse effects caused by the sunshade net coverage. However, while these methods are convenient and quick, there are also certain drawbacks. One is that mud and ink are easily washed away by the rain, and it is troublesome to make up and down the spray. The second is that if the mud is splashed too much or the ink is sprayed too thick, and it meets a continuous sunny day, it is equivalent to covering the shade net throughout the day, and it is easy to form a low-light hazard.

In order to overcome the above drawbacks, some vegetable growers sprayed mud or ink-jet juice on the inner surface of the film, so that the mud and ink stick to the inner surface of the film, which can effectively prevent the rain from destroying them. It is a good method, but the mud After splashing, a large part of it will fall on the leaves of vegetables, which will affect the light-receiving area of ​​the plants, resulting in the failure of photosynthesis. Inkjet juice also has such drawbacks, and the main raw materials for ink are soot, rubber, additives, etc. The inside of the soot component is not clear, it is very likely to cause harm to vegetable production, but it should be used with caution.

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