In winter greenhouses, vegetables often appear as “flash sprouts†after the weather turns cloudy and clear. The so-called “flash seedlings†are the seedlings of vegetables that are stimulated by cold winds and are exposed to cold temperatures for too long. When the temperature suddenly increases, the plant leaves lose water. phenomenon. The sprouts of the seedlings after the "flash seedlings" wilted. After the restoration, the edges of the leaves became yellow or dry. When the seedlings became severe, the whole plant died. In the past, we dealt with greenhouse vegetable “flash sprouts†as long as we carried out “exposing flowers and spraying warm water (opening up covered straw and spraying warm water at about 15° C.)â€. Nowadays, most of the winter-warm greenhouses use shutters. This method does not apply. Then, how do vegetable growers using roller shutters respond to vegetable sprouts? Here, the author of China Agricultural Network introduced several methods for the reference of farmers.
1. Pull drafting curtains when the rainy days suddenly turn cloudy, first raise the straw curtains on the sheds to 1/4~1/3 (should avoid pulling all the straws to expose the vegetables to sunlight). When the sunlight is too strong, the front face of the shed can be opened first (since the light entering from the front face of the shed is mostly diffuse light), after a period of time, the turf curtain is gradually pulled up and vegetables will not be acute. The wilting "flashing seedling" was already.
2. Repeatedly pulling the straw curtain When the continuous rainy weather is suddenly fine, you can pull the straw curtain for 5 minutes and then put it down. After 5 minutes, pull it up again. Repeatedly, the interval time is lengthened to allow a small amount of light to enter. . After 3 to 5 pulls, the vegetables in the shed will adapt to the sudden change of the environment. The leaves of the plants will stretch normally and will naturally no longer suffer from acute wilting “flash sproutsâ€. If symptoms of mild wilting are found, combined with spraying warm water to increase soil moisture and reduce evaporation of leaves, it can alleviate the phenomenon of “flash sproutâ€.
3. Pull drafting curtains early if the temperature outside the shed is not very low, you can pull the drafting curtains earlier and plant the virus-free potato planting technique. But you must carefully observe the weather changes. If you find that the weather is going to be sunny, if you feel that the temperature outside the shed is not very low, It is possible to roll up the straw curtain as soon as the sun shows up, so that it is much less likely that the vegetables will have an acute wilting “flash sprout†than when the sun comes out.
4. Use shade nets to block the curtains after drafting, and then cover them with shade nets for more than ten minutes. This can effectively avoid the phenomenon of “flash sprouting†of vegetables caused by excessively pulling straw curtains.
5. After spraying the liquid fertilizer and adopting the above measures, if “flashing seedlings†phenomenon still occurs, you can spray Shuofong 481 or marine biosynthetic liquid and green blood flow liquid fertilizer to supplement water and nutrients and induce vegetable vitality.
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