In recent months, bad weather such as rain, snow, low temperatures, and haze have occurred in northern China. Many shanty farmers have improper methods to uncover the grasshoppers, and there have been phenomena such as dry leaves of greenhouse vegetables and even dead seedlings when the air outlet size is improper. Here, to remind the majority of farmer friends, exposing the grassland should pay attention to science:
First, exposing the grass in the morning
The author 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. In fact, should use the gas inside the shed? The magnetic unloading jurisdiction is also punished 氖 氖 氖 涫 涫 涫 窈 窈 窈 ㄊ ㄊ ㄊ ㄊ ㄊ ㄊ ㄊ ㄊ ㄊ ㄊ ㄊ ㄊ ㄊ ㄊ ㄊ ㄊ 椅 椅 椅 椅 椅 椅 椅? In case of absurdity, there is no way to say goodbye to the joys of the people.
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. Emphasizing that the temperature reaches 17°C to 18°C, Ganoderma lucidum is related to the transport of organic matter. Plants produce organic matter through photosynthesis and are manufactured during the day and transported to the various organs of plants (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 transportation speed is directly related to the greenhouse temperature. In the case of 17°C~12°C, the transportation is completed in 7 to 8 hours, and if the greenhouse temperature is lower than At 15°C, it will take 15 to 16 hours to complete the transport. The organics that have not been shipped to the uncovered plants will not be transported until the next night. The warehouse will not be released and will directly affect the production of photosynthetic products on the next day. great influence.
Third, a long time uncovered
After a long period of low temperature, rain, snow, and even sunny days, do not open all the grasshoppers to prevent “flashing seedlings†(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 will make the leaves lose water and wilt, resulting in thin, yellow and tender leaves, weak fibrous tissue, which is very easy to produce phytotoxicity). In the first three days, flower pods should be deposed (every time, one or two are exposed). The area uncovered gradually increased, and all were uncovered two days later (the shed could be opened first, then gradually increased).
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