Wind and snow weather, timely management, heavy storm, and snow weather have caused short time loss and heavy losses to greenhouse vegetables. Therefore, it must be highly concerned and managed in a timely manner. Before the arrival of strong winds, heavy snow, or heavy snowstorms, it is necessary to timely reinforce the shed and repair the shed film, and watch and listen to the weather forecast every day. The sheds must be sealed and the shed film and grasshoppers must be tightly closed and compacted; the laminating lines and straw ropes should be updated every year; not only the longitudinal grass ropes should be fastened and pressed tightly, but also in the windy days. Add 3-4 horizontal drawstrings. If there are no columns or columns in the shed, the number of columns should be increased to increase the load in the shed. In order to facilitate cleaning snow on the shed, two layers of film should be placed on the grass rake. At the same time, when heavy snow or blizzard lands, snow conditions should be observed at any time, and the snow on the shed should be cleared in time to prevent collapse of the shed.
Fine misty weather Fine tube winter fog weather is the more common bad weather. In the continuous fog weather, heat preservation and dehumidification are the management priorities. If it is not absolutely necessary, do not water, fertilize, spray or prevent pests. When it is really necessary to use the above measures, under the guidance of technicians and experienced farmers, avoid the weak growth period of vegetables caused by continuous fog, use drip irrigation, micro-spraying, sub-film furrow irrigation, fertilization, foliar fertilizers and aerosols. , tampering and other agricultural and physical measures, water and fertilizer management and pest control. In the foggy days of the past days, attention should be paid to increasing the amount of astigmatism. Every day at noon, when the temperature is high, the grasshoppers will be pulled open. There are power supply conditions that can be used for 40W plant fill lights, plant growth lights or 120W greenhouse cucumber special fill lights and other special Or ordinary fluorescent light to fill light.
Cold and cold science pipes are installed in the cold-proof ditch. Dig 30 cm wide and 50 cm deep in the cold-proof ditch in front of the shed. Fill the straw, leaves or weeds to increase the temperature of the shed by 3°C; hang the light curtain and leave it on the north side of the shed. Hanging reflective screen on the shed wall can increase the temperature of the shed by 2°C, increase the illuminance by 20%-30%, and increase the ground temperature by about 1°C. The scientific fertilizer water should not be watered when the shed temperature is lower than 8°C. For fertilization, it is necessary to apply 0.3% of potassium dihydrogen phosphate, 0.3% of calcium nitrate, 1%-2% of fertilization or compound fertilizer filtrate, or 1% of glucose solution for foliar application; Outside the greenhouse, when the temperature is below 6°C, straw, fireweed, coal, etc. should be used in time to increase the temperature, but the smoke must be discharged outside the greenhouse. If there are power conditions, electric heaters can be used to increase the temperature so as to allow the greenhouse vegetables to survive the adverse weather conditions and resume production quickly.
The sudden rise in temperature and sudden dip in the flexible pipe in the past few days when the fog suddenly cleared, do not immediately open the straw, to pull a half cover or a row to pull a pull, so that for three consecutive days, gradually adapting the greenhouse vegetables to the environment Changes to prevent rapid high temperature and direct sunlight in the shed, resulting in a large number of transpiration of vegetables within the shed, and due to weak roots, aging and poor absorption, resulting in dehydration, wilt and death. When the temperature suddenly drops sharply, it is necessary to pull the grasshoppers later, cover the grasshoppers earlier, and extend the covering time to accumulate temperature in the shed to reduce the temperature of the shed. At the same time, when the temperature suddenly changes, do not use water, fertilize and spray to prevent and control pests, so as to avoid cooling and injuring the roots, causing death and aggravating pests and diseases.
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