In winter, greenhouse vegetables often appear as "flash sprouts" after turning cloudy and clear, that is, the seedlings of vegetables are stimulated by cold wind or the temperature is too low for a long time. When the temperature rises suddenly, the leaves of the plants are dehydrated. 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. For greenhouse vegetable “flash seedlings†that cover only grasshoppers, simply expose flowers and spray warm water. For farmers who use roller blinds, the following measures can be taken to deal with vegetable sprouts.
Part of the drafting curtain
After a sudden turn of rain on a continuous cloudy and rainy day, first lift the grass curtains on the sheds by 1/3 or 1/4. Do not pull all the straws to expose the vegetables to sunlight. When the sun is too strong, you can open the front face of the shed first, because the light entering from the front face of the shed is mostly scattered light. After a period of time, the turf curtain is gradually pulled up and the vegetable seedlings will not Acute wilting occurred.
Repeatedly pulling straw
When it is suddenly clear after continuous rainy weather, we can pull the straw curtain up for 5 minutes and then put it down. After 5 minutes, pull it up again. This way, the interval time will gradually increase, allowing a small amount of light to enter. Generally, 3 to 5 pulls are performed. The vegetables in the shed will adapt to the suddenly changed environment. The leaves of the plants will stretch normally and natural wilting will no longer occur. If symptoms of mild wilting are found, spray water can be used in combination to increase soil moisture and reduce leaf water evaporation, thus relieving “flash sproutsâ€.
Pulling in the straw early
If the temperature outside the shed is not very low, the grass curtain can be pulled early. Requires careful observation of weather changes. If it is found that the weather is about to clear, in the case that the temperature outside the shed is not very low, we can roll up the straw curtain before the sun shows up. This will cause the vegetable to appear acute after the sun comes out. The probability of wilting is much smaller.
Shade with shade
After drafting the curtain, it was first covered with a shade net for more than ten minutes, and it was also possible to effectively avoid the phenomenon of “flash sprouting†of vegetables due to the oversight of pulling the straw curtain.
Spraying liquid fertilizer promotes recovery
After the above measures are taken, when heavier “flashing seedlings†still occur, they can be sprayed with Shuofeng 481, marine biotin, and green blood-vein liquid fertilizers, etc. to supplement water and nutrients, induce vegetable vigor, and have obvious effect in restoring growth.
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