Correctly exposing the grass and grasshoppers is extremely important for the production of vegetables in winter greenhouses. Here, to remind the farmers, lay bare grass and grass should pay attention to science:
First, exposing the grass in the morning
I once asked many farmers: What is the basis for exposing the grasshopper in the morning? The answer is very consistent: When the sun shines on the shed, it is revealed. To what extent did you expose it? Most shed farmers cannot answer it. The temperature of the shed should be used to determine if the time is right. The method is: the temperature in the shed will be reduced, but the decrease cannot exceed one degree. More than one degree indicates that the eviction is early, and the temperature in the shed is lifted. No reduction, indicating that the grasshopper was released late.
Second, cover the grass in the afternoon
At present, the majority of vegetable growers cover the grass in the afternoon. There are many cases where the sun goes down. Some cover it at half past three to four in the afternoon. Actually, this is not scientific. The temperature of the shed should be used to determine the time for grass cover. . The method is: When the temperature in the shed reaches 17°C～18°C, the grass cover will begin to cover, and the temperature in the shed may rise after the cover is covered. The temperature rise cannot exceed one degree. Emphasizes that temperatures reach 17°C to 18°C. Ganoderma lucidum is related to the transport of organic matter. Plants produce organic matter through photosynthesis, which are manufactured during the day and transported to the various organs of the plant (roots, stems, leaves, and fruits) at night. When the greenhouse is covered with grasshoppers, the stomata of the crops are closed, and transportation begins. The transport speed is directly related to the greenhouse temperature. In the case of 12°C to 17°C, transportation is completed within 7 to 8 hours, and if the greenhouse temperature is lower than At 15°C, it will take 15 to 16 hours to reach the end of the journey. Organic matter that has not been transported to the exposing plant will not be transported until the next night. The warehouse will not be released and will directly affect the production of light and products on the second day. The output has a great influence.
Third, a long time uncovered
After a long period of low temperature, rain, snow, and sunny days, do not open all the grasshoppers to prevent “flash sprouts†(a few days of rain and snow did not reveal the grass, the crops in the shed did not see light, the leaves were thin and tender, and the sunny days were strong. , Large amount of transpiration, so that the leaves dehydration and wilting), the first three days should expose the flower buds (every time, one or two, one or two, and one to expose one), the area opened gradually increased, and the whole area will be uncovered after two days. Can be opened first, then gradually increase).
First, exposing the grass in the morning
I once asked many farmers: What is the basis for exposing the grasshopper in the morning? The answer is very consistent: When the sun shines on the shed, it is revealed. To what extent did you expose it? Most shed farmers cannot answer it. The temperature of the shed should be used to determine if the time is right. The method is: the temperature in the shed will be reduced, but the decrease cannot exceed one degree. More than one degree indicates that the eviction is early, and the temperature in the shed is lifted. No reduction, indicating that the grasshopper was released late.
Second, cover the grass in the afternoon
At present, the majority of vegetable growers cover the grass in the afternoon. There are many cases where the sun goes down. Some cover it at half past three to four in the afternoon. Actually, this is not scientific. The temperature of the shed should be used to determine the time for grass cover. . The method is: When the temperature in the shed reaches 17°C～18°C, the grass cover will begin to cover, and the temperature in the shed may rise after the cover is covered. The temperature rise cannot exceed one degree. Emphasizes that temperatures reach 17°C to 18°C. Ganoderma lucidum is related to the transport of organic matter. Plants produce organic matter through photosynthesis, which are manufactured during the day and transported to the various organs of the plant (roots, stems, leaves, and fruits) at night. When the greenhouse is covered with grasshoppers, the stomata of the crops are closed, and transportation begins. The transport speed is directly related to the greenhouse temperature. In the case of 12°C to 17°C, transportation is completed within 7 to 8 hours, and if the greenhouse temperature is lower than At 15°C, it will take 15 to 16 hours to reach the end of the journey. Organic matter that has not been transported to the exposing plant will not be transported until the next night. The warehouse will not be released and will directly affect the production of light and products on the second day. The output has a great influence.
Third, a long time uncovered
After a long period of low temperature, rain, snow, and sunny days, do not open all the grasshoppers to prevent “flash sprouts†(a few days of rain and snow did not reveal the grass, the crops in the shed did not see light, the leaves were thin and tender, and the sunny days were strong. , Large amount of transpiration, so that the leaves dehydration and wilting), the first three days should expose the flower buds (every time, one or two, one or two, and one to expose one), the area opened gradually increased, and the whole area will be uncovered after two days. Can be opened first, then gradually increase).
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