Grasshoppers in the case of agricultural vegetable greenhouses, cultivation of protected areas, especially in northern winter greenhouses, fruit and vegetable cultivation, is a major feature of China's agricultural production. It should be recognized that the emergence of greenhouse production has successfully improved the living standards of the people in our country, allowing people to eat fresh fruits and vegetables in the cold winter; at the same time, greenhouse production has also become an effective way for the shed farmers to increase income. It should also be acknowledged that the production of greenhouses is itself a deterrent. Therefore, a small mistake in the management process will result in significant losses. From late February to early March, there was continuous rain and snow on a large area of ​​the country. Many shanty farmers had improper methods of exposing the grasshoppers, and the improper size of the air outlets resulted in dry leaves of the greenhouse crops and even dead seedlings. What can you do to avoid mistakes? Now put your own views for the reference of the vast number of shed farmers.
1. After sunny days, it is sunny and sunny. Do not open all the grasshoppers. The first three days should be followed by exposing the gardenia. The area opened will gradually increase and it will only be fully opened after three days. For several days, the rain and snow did not reveal the grass. The crops in the shed did not see light. The leaves were thin and tender. After the sunny days, the light was very strong and the transpiration was very large. It was easy to make the leaves dry and dry, which is what the people said. "Flash" the leaves.
2. Continuous rain and snow in winter and early spring, especially the sunny days after the snow should be particularly careful, the outlet must be small, if the outlet is large, too much cold air into the shed, it will make the leaves suffer cold and dry death. The correct approach is: the first day the outlet is small, gradually increase in the next two or three days; or in the short time after the atmospheric temperature rise at noon. The above two points are issues that should be taken into account in special climate conditions. In the normal management process, exposing the grasshopper and covering grasshoppers should also be scientific.
3. In the morning, the grass was cleared. I have asked many shed farmers: What is the basis for exposing the rake in the morning? The answer is very consistent: When the sun shines on the shed, it is uncovered. To what extent did you expose the child? Most shed farmers cannot answer it. The temperature in the shed should be used to determine if the time is right. The method is: to uncover the temperature in the grass shed, the temperature in the shed will decrease, but the decrease cannot exceed one degree. More than one degree shows that the grass rake has been uncovered early and the grass is uncovered. The temperature in the sub-pavilion did not decrease, indicating that the grass carp was exposed late.
4. Afternoon cover the grass. At present, the vast majority of shed farmers cover the grass in the afternoon. There are many cases in which the sun goes down and the rice dumplings are covered. Some of them cover the rice dumplings at half past three to four in the afternoon. In fact, this is not scientific and should be determined based on the temperature in the shed. Grass rake time. The method is: When the temperature in the shed reaches 17 to 18 degrees, it starts to cover the grass. After covering the scorpions, the temperature in the shed may increase, and the temperature rise cannot exceed one degree. Emphasizing that the temperature reaches 17 to 18 degrees, Ganoderma lucidum is related to the transport of organic matter. Except for sedum crops (such as aloe vera and fresh palm), plants produce organic matter through photosynthesis and are manufactured during the day and transported to the plants at night. Organ (root, stem, leaf, fruit). When the greenhouse is covered with grass rakes, the stomata of the crops are closed, and transportation begins. The transportation speed is directly related to the temperature of the shed. At 17 to 22 degrees, 7 to 8 hours are transported, and if the shed temperature is lower than At 15 degrees, it will take fifteen or six hours to finish. The organics that haven't been shipped to the uncovered rice dumplings will have to wait until the next night for transportation. The warehouse will not be released and will directly affect the production of light and products on the second day. The impact on the production of greenhouses is very large. Due to the high temperature in the shed where the straw bioreactor is used, it is necessary to pay attention to the occurrence of the aforementioned disasters without exposing the plants to fast growth and tender plants.
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