In production, many vegetable farmers do not care about the angle of suspension of the light curtain, and it is incorrect to think how to hang it. Especially in the winter when the sky is cloudy, vegetables are in great need of light. If the hanging light curtain does not achieve the desired effect, it will seriously affect the increase in production and income of vegetables. So, how can a reflective screen be reasonable?
The angle and height of the light curtain must be properly adjusted depending on the season. In winter, the hanging curtains are generally shorter and are mainly suspended or slightly inclined close to the ground.
It depends on the growing situation of vegetables. If the plants have just been planted, the reflective screen will mainly function to increase the temperature of the ground and promote the slow seedlings. The light curtains must be hung lower and can be hung vertically. If the plants are larger, the bottom of the light curtain should be raised near the apex of the plant, and the angle should be slightly inclined to the south at the bottom to ensure that the reflected light level at 8:30-9:00 am is basically the same as the ground level. Under normal circumstances, the light curtain is kept at a 75-85 degree angle to the ground.
It should be noted that when the vegetables are in the seedling stage, the plants close to the light curtain should pay attention to replenishment, so as to avoid strong weather and high temperature when the weather is fine.
In addition, the reflective screen also blocks a large amount of light shining on the wall while increasing the light, reducing the heat storage capacity of the wall, and the wall has a low heat storage capacity, and the night temperature in the shed cannot be guaranteed. Therefore, the inner surface of the scaffolding wall cannot be completely covered with a light curtain. Under normal circumstances, it is sufficient to set up a reflective screen with a width of 2 meters and the length of the canopy only on the north wall of the greenhouse. The specific setting method is to pull a wire along the aisle at the height of 2m behind the back wall. Two 1-meter-wide light curtains were cut to length on demand and bonded to 2 meters wide curtains with clear tape. The upper end of the curtain is folded back and covered with wire, and then fixed with a transparent tape to form a natural drooping curtain.
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