In the Huanghuai area, greenhouse crops are often reduced due to climate problems during the winter, and they even have to be harvested. As long as effective preventive measures are taken, greenhouse melons can still obtain high quality, high yield, and high efficiency in case of severe weather.

When the snowfall falls, it is necessary to cover the grasshoppers. After the snow stops, clear the snow immediately to ensure that the cover is dry. When the weather turns fine, remove the cover slowly to facilitate light transmission. If the weather is clear after continuous snowfall, coverings should be removed one after another to prevent the occurrence of flash seedlings. If there is withered seedlings after exposing the seedlings, they shall be immediately covered with grasshoppers. After the seedlings are recovered, they shall be removed again. Such repeated two or three days, and then transferred to normal management.

Cold weather In order to avoid cold damage caused by winter and early winter cold currents, we should dig 0.8 m wide and 0.8 m deep cold ditch around the greenhouse in advance according to the weather forecast. Fill the slag or cover it with straw to increase the ground temperature around 5°C. . Before the advent of the cold current, 6-8 layers of thick paper are placed on the grasshoppers. When it is urgent, old bedding, old blankets, etc. can be used to cover the area. If gaps are found at the joints of various parts, they must be blocked immediately. If necessary, hot air, electric heating line, fire tunnel, coal stove, etc. can be used for heating. If the cold flow for a long time, should be removed before and after noon cover, and carefully observe the temperature changes, the temperature drop immediately covered grasshoppers, until the temperature rises and then reopened, after 2 pm cover insulation.

In rainy weather, cold rain should be covered with a 0.1 mm thick rain-proof plastic film on the haystacks, and drains should be repaired around the greenhouse. In case of continuous rainfall for a long period of time, attention shall be paid to intermittently removing the cover, supplementing the indoor sunshine, and hanging a light curtain on the back wall of the greenhouse, or adding a 200 watt light bulb, fluorescent lamp, high pressure mercury lamp, arc argon lamp per 50 square meters. To increase the sunlight in the greenhouse, the lights and the leaves of the plants should be kept at a distance of about 60 cm. The light should be turned on for 2 to 3 hours every day in the morning. After the indoor light intensity increases, the light is stopped and the rainy weather can fill the light all day long.

Before the strong winds and strong winds arrive, they should use the corn stalks and sorghum stalks as a wind barrier according to the weather forecast on the windward side of the greenhouse at a distance of 1 to 2 meters from the greenhouse. Fix the coverings during the day and cover them at night to prevent them from being trapped. The wind blows off and freezes the seedlings. To avoid cold air blowing directly from the bottom corner, you can take measures to change the vents to prevent heat and wind hazards.

Around noon around noon, the sun shines around noon, and the temperature changes rapidly. If clouds appear in the sky, you should always pay attention to changes in temperature. When the clouds cover, when the temperature is lowered, the ventilation openings are closed, and the clouds pass the sunrise. The temperature will quickly rise again. Ventilation openings should be opened in time to prevent burned seedlings, especially when the top of the seedlings touches the plastic film.

After a long period of cloudy days, spraying urea on leafy vegetables; spraying ternary compound fertilizers or sprayed treasure or photosynthetic fertilizers on vegetables and solanaceous vegetables; potassium dihydrogen phosphate and potassium sulfate should be sprayed on root vegetables. , superphosphate and other fertilizers. If the soil moisture is not enough, it should be poured once a day before and after noon in sunny weather, and flooding should be prohibited. The day before spraying or watering, most of the flowers and young fruits on the plant can be removed, which has a significant effect on promoting the recovery of the crop.

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