Shed room covered with black shade net
Release time:
2020-08-26
With the advent of summer, the high temperature and strong light around noon is very unfavorable to the growth of vegetables. Due to the low cost of covering the sunshade net, convenient suspension and sensitive operation, it can be said that it is a cooling method widely used by vegetable farmers in summer. However, it is suggested that vegetable farmers should pay attention to the fact that in the process of using the sunshade net, many vegetable farmers try to directly cover the sunshade net on the shed film. Not only did not play the role of cooling, but affected the normal growth of vegetables in the shed.
With the advent of summer, the high temperature and strong light around noon is very unfavorable to the growth of vegetables. Due to the low cost of covering the sunshade net, convenient suspension and sensitive operation, it can be said that it is a cooling method widely used by vegetable farmers in summer. However, it is suggested that vegetable farmers should pay attention to the fact that in the process of using the sunshade net, many vegetable farmers try to directly cover the sunshade net on the shed film. Not only did not play the role of cooling, but affected the normal growth of vegetables in the shed.
reason analysis
At present, vegetable farmers usually cover up the black sunshade net. Under the sunlight, the black sunshade net will absorb a lot of heat. After being close to the greenhouse film, there will be the following two disadvantages: first, the heat absorbed by the sunshade net is simply transferred to the greenhouse film, increasing the temperature of the greenhouse film, which will accelerate the aging of the greenhouse film and reduce the service life of the greenhouse film; Second, the absorbed heat is not easy to be emitted, can not play a good role in reducing the temperature of the shade net shed. So, how should the shade net cover up?
Shading net reasonable cover
The sunshade net should not stick to the shed film, and vegetable farmers are advocated to hold up the sunshade net and keep a distance of at least 0.5-1 meter from the shed surface, so that the air energy between the sunshade net and the shed surface can move and accelerate the heat loss in the shed.
Of course, after correctly covering the sunshade net for sunshade cooling, the sunshade net is not intact, but should be sensitively adjusted according to the weather conditions, vegetable varieties and vegetable growth stages to the requirements of light intensity and temperature. Generally, it is covered on sunny days and uncovered on cloudy days. Cover at noon, sooner or later; Vegetables are covered in the early stage of growth and uncovered in the late stage of growth. Even if it is sunny, the sunshade net should not be covered for a long time. The covering time is concentrated at the stage of strong noon on sunny days. Its specific use time can be from 10 am to 3 pm.
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