Many vegetable farmers have this feeling. They all say that they have a good outlook, but they have no effect on their own use, and they feel no increase in their output. In the end, what causes it? When the reporter went to the countryside, he saw a lot of hanging curtains and thought that the problem was in the vegetable farmers themselves, and they did not make good use of the advantages of a good light curtain.
In response, Zhu Zhenhua reminds farmers to use the reflective screen with the following points:
First of all, in the initial stage of planting, near the light curtain should pay attention to watering, water should be sufficient, so as to avoid burning high temperature caused by strong light. The effective period of use is generally from November to April of the following year. For a backlit solar greenhouse, the reflective screen must be hung on the north wall. The front of the aluminized film should be sunny. Otherwise, the film surface is too close to the wall, and the aluminum film can easily come off due to moisture. After use, it is best to be air-dried and then stored in a ventilated and dry place for reuse.
Second, the light curtain must be applied in a solar greenhouse that reaches the photosynthetic temperature. If the greenhouse is not well insulated, it is effective to rely on the light curtain to increase the temperature and the ground temperature in the greenhouse during the day. However, it will inevitably be damaged at low temperatures during the night. Because the main role of the light curtain is to increase the light intensity and the daylight temperature in the back of the greenhouse, and expand the temperature difference between day and night in the rear, so as to tap the potential of the growth of the rear crops.
In addition, the angle and height of the light curtain need to be appropriately adjusted depending on the season and crop growth conditions. In winter, when the height of the sun is small, the height of the hanging curtain of the light curtain is generally short. Especially for the cultivation of dwarf crops, the lower side of the light curtain should be close to the ground or close to the top of the plant, and it should be inclined vertically or slightly to the south. When cucumbers and other melons and tomatoes and other solanaceous high pole vegetables are in fruiting stage, the plants are tall and their requirements for light increase. Especially when the early and late light conditions are strong, the height of the reflective curtain should be properly raised to the bottom. It is advisable to increase the position near the top of the plant in the high stalk crop, and the angle is slightly inclined towards the south from the bottom. In the spring, when the height of the sun increases, the north side of the light curtain should be tilted to the north, and the light curtain should be adjusted to maintain a 75-85 degree angle with the ground plane so that within two hours after sunrise and within two hours before sunset. The reflected light is basically level with the ground as well. After entering April, with the temperature rising, the light is sufficient, and the low light and ground temperature factors that restrict the growth and development of vegetables no longer exist. At this time, the light curtain has completed its role and should be promptly removed.
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