In the winter, in order to cope with the "shallow shed" after sunny days, the vegetable farmer had a good experience of exposing the flowers and spraying warm water. However, over time, most of the winter warm-type greenhouses used shutters. Obviously, the use of shutter machines cannot achieve "exposing flowers." Therefore, in the past two years, once the sunny days suddenly turned cloudy, there will always be a lot of greenhouse vegetables "flashing seedlings." Then, how can farmers who use roller shutters respond to the “shuttering� Here, according to the experience of some vegetable farmers, the author summarizes some points for the reference of farmers. The first is to lift the straw curtain by one third or one quarter. Even after the sunny day suddenly turns cloudy, you can first raise the straw curtain by one third or one quarter. Do not pull all the straw curtains and expose the vegetables to sunlight. When the sun is too strong, you can first open the front of the shed, because the light coming from the front of the shed is mostly scattered light. After a period of time, the straw is gradually pulled up, and the vegetables will not be acutely wilted. The second is to repeatedly pull the straw curtain. You can pull the straw curtain for 5 minutes and then put it down. After 5 minutes, pull it up again. This repeated operation will gradually increase the interval time. After 3 to 5 pulls, the vegetables in the shed will adapt to the sudden changing environment. Naturally, there will no longer be acute wilting. If symptoms of mild wilting are found, they can be relieved by spraying warm water. Third, if the temperature outside the shed is not very low, grass curtains can be pulled early. Observe the changes of the weather carefully. If it is found that the sky is going to be sunny, and if the temperature outside the shed is not very low, you can roll up the straw curtain before the sun shows up. This will cause the vegetables to be acute compared to the draft curtain drawn after the sun comes out. The chance of wilting is much smaller. The fourth is to shade temporarily with a shading net. During the interview, the reporter discovered that some vegetable farmers had shaded the net for more than ten minutes after drafting their curtains. It was also possible to effectively avoid the phenomenon of “flashing sheds†due to over-emphasis on pulling straws.
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