The so-called flash seedlings refers to the fact that vegetable seedlings suffer from cold wind or low temperature for a long time. When the temperature rises suddenly, the leaves of plants lose water. After emergence, the leaves of the seedlings were wilting and drooping. After restoration, the edges of the leaves became yellow or dry, and the whole plant died in severe cases. In the past, winter shed vegetables often flashed after turning cloudy and sunny. At that time, it was only necessary to carry out "exposing flowers and spraying warm water" (opening the covered straw curtain at a distance of one room and spraying warm water of about 15°C). Most of the winter-warm greenhouses now use shutters. Obviously, greenhouses using roller shutters cannot be "exposed." So how do these greenhouses respond to vegetable flashers?
Repeatedly pulling the straw curtain when the weather suddenly cleared after continuous rain and snow, the straw can be pulled up for 5 minutes and then put down, after 5 minutes and then pull up, so repeated operation, the interval gradually lengthened, let a small amount of light into. Generally, 3 to 5 pulls are performed. The vegetables in the shed will adapt to the sudden change of the 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 to increase soil moisture and reduce leaf water evaporation, thus reducing the occurrence of flash seedlings.
Some drafting curtains suddenly turned green after continuous rain and snow weather, first raised the sheds covered by the sheds to 1/4 to 1/3, and should not pull all the straws up so that the seedlings were all exposed to sunlight. After a period of time, when the grass curtain is gradually pulled up, flashing will not occur.
Pulling Drafting Drafts Early If the temperature outside the shed is not very low, the drafting curtain can be drawn early. Requires careful observation of weather changes. If it is found that the weather is going to be sunny and the temperature outside the shed is not very low, the straw can be pulled up before the sun shows up, so that the drafting curtain is pulled out after the sun comes out and vegetables sprout. The probability is much smaller.
After shading draft curtains were shaded with shade nets, they were shaded with shade nets for more than ten minutes. This can effectively prevent vegetable flash seedlings from appearing too quickly due to drafting.
Sprayed liquid fertilizer can still be sprayed and severe when the above measures are taken. Spray some phytonutrients to supplement the water and nutrients, increase the vitality of the vegetables, and promote their growth.
Repeatedly pulling the straw curtain when the weather suddenly cleared after continuous rain and snow, the straw can be pulled up for 5 minutes and then put down, after 5 minutes and then pull up, so repeated operation, the interval gradually lengthened, let a small amount of light into. Generally, 3 to 5 pulls are performed. The vegetables in the shed will adapt to the sudden change of the 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 to increase soil moisture and reduce leaf water evaporation, thus reducing the occurrence of flash seedlings.
Some drafting curtains suddenly turned green after continuous rain and snow weather, first raised the sheds covered by the sheds to 1/4 to 1/3, and should not pull all the straws up so that the seedlings were all exposed to sunlight. After a period of time, when the grass curtain is gradually pulled up, flashing will not occur.
Pulling Drafting Drafts Early If the temperature outside the shed is not very low, the drafting curtain can be drawn early. Requires careful observation of weather changes. If it is found that the weather is going to be sunny and the temperature outside the shed is not very low, the straw can be pulled up before the sun shows up, so that the drafting curtain is pulled out after the sun comes out and vegetables sprout. The probability is much smaller.
After shading draft curtains were shaded with shade nets, they were shaded with shade nets for more than ten minutes. This can effectively prevent vegetable flash seedlings from appearing too quickly due to drafting.
Sprayed liquid fertilizer can still be sprayed and severe when the above measures are taken. Spray some phytonutrients to supplement the water and nutrients, increase the vitality of the vegetables, and promote their growth.
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