Low-temperature and low-temperature facilities in cloudy and rainy weather

In recent days, there have been continuous rainy weather in Shaanxi Province, and the temperature has been falling all the way. This has negatively affected the growth of vegetables in greenhouses. On October 22nd, the reporter saw some vegetable greenhouses in Wuquan Town, Yangling Demonstration District, Shaanxi Province. Seen from the continuous cloudy and rainy days, the tomato plants grew weak and the fruit was not large. “This year, a tomato planted in one mu of shed has lost at least 10,000 yuan!” In a vegetable base at Wuquan Village, Wuquan Town, Master Liu looked at many “thin” tomato plants in front of him, and looked helplessly.

"The plant has the characteristic of growing to light. If the weather is rainy and rainy and the sun is scarce, it will cause the plants to grow vigorously and grow in length. If the nutrient growth can not keep up, it will inevitably lead to atrophy of reproductive growth, that is, fruit growth is poor." Northwest Agriculture and Forestry Technology According to Li Huike, an associate professor at the College of Resources and Environment, the continuous rain will cause a small water pressure difference, which is not conducive to plant growth and cause physiological diseases. At the same time, high humidity can easily cause the growth of pathogens and infect weak and diseased plants.

Expert advice:

Dry to keep the soil dry

Sustained low temperature and rainy weather, excessive soil moisture, so that the relationship between water and gas in the soil imbalance, the root activity is poor, affecting the suction capacity of absorbent. Therefore, ditches should be dug to drain the water and prevent waterlogging on the surface.

Warm a variety of ways to warm

When the daytime temperature in the booth is lower than 15°C and the nighttime temperature is lower than 5°C, cold or freezing injury may occur. Temporary warming measures should be taken at night to artificially supplement heat energy. Several briquettes can be placed in the shed to increase the temperature inside the shed. However, attention should be paid to preventing carbon dioxide poisoning. When adding briquettes and removing coal stoves, greenhouses should be ventilated and enter people later. An incandescent light is used in the shed to enhance photosynthesis, increase plant resistance, and ensure safe wintering of seedlings. Crops have the strongest absorption of red light and blue-violet light. Light sources such as fluorescent lamps, high-pressure mercury lamps, and arc xenon lamps are preferred.

Tubes to prevent vegetables from losing water and sprouting

After being exposed to different degrees of cold or freezing injury, or even when the sky is cloudy, vegetables should be shaded in the shed to prevent the frozen vegetables from being directly exposed to the sunlight and to avoid the loss of vitality due to water loss and tissue shrinkage. Before clearing the grass in the sunny days, some fresh water can be sprayed on the leaves to increase the temperature; the grass beech should be gradually opened to gradually see the seedlings so as to avoid the phenomenon of “flashing seedlings”.

Governance to prevent the spread of diseases

Greenhouse vegetables should focus on the management of temperature and humidity and the proportion of nitrogen, phosphorus and potassium fertilizers. In particular, nitrogen fertilizers must not be biased, and attention should be paid to the application of organic fertilizers. Continuous rain, cold weather, humidity in the shed, pay attention to vegetable melons, gray mold disease incidence and spread.

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