First, the formation of reasons 1. It is persistently cloudy or rainy, and the weather is steep and clear. 2. The cucumber enters the flowering and melon stage, and is sunny and high-temperature, with a large amount of air, and the transpiration of leaves is fast. Some plants with poor hair roots begin to atrophy, and the whole plant withered when it is seriously dehydrated. 3. The film covered by the greenhouse was partially damaged, and cold winds caused a wilting dead seedling. 4. It is the excessive fertilization concentration, especially if the fertilizer is applied near the roots and stems of cucumbers, which can easily burn the dead seedlings. Second, prevention and control measures Watering due to seedlings: The root system of cucumber is relatively developed, but most of it is concentrated on the soil surface. In order to promote hair rooting, avoid watering errors and inhibit the growth of root groups. 1. Make little planting water. 2. It is poured back to the seedling water as appropriate. The temperature is low, the soil moisture is high, and even rainy weather is encountered, and little or no water is returned to the seedlings. 3. It is the period of entering the melon period, combined with topdressing, with the use of fertilizer, applied once every 10 days or so, to prevent excessive burning of melon seedlings. 4. It is advisable to water in sunny mornings and avoid watering in the afternoon and evening. 5. Rainy days should not be filled with water in the entire shed. 6. It can only infiltrate with small water, and it can not flood irrigation. Scientific control of greenhouse temperature: In the initial stage of colonization, it is generally not ventilated, kept in the shed during the day at 25°C to 30°C, and kept at 12°C to 15°C during the night and not less than 10°C. With the continuous growth of melon seedlings, it is necessary to adjust the temperature and control the temperature in time to prevent the occurrence of diseases; second, to avoid plant aging. However, the regulation of temperature must be conducive to the growth of cucumbers. Generally, the temperature rises to 30°C during the day and it is ventilated. In the afternoon, the film is closed at 28°C. The night temperature during the melon period should not fall below 12°C. Third, strengthen the protection of greenhouses 1. Keep the canals around the canned cucumbers unblocked for timely drainage and irrigation, especially for rapid water filtration. 2. It is necessary to check if the film is damaged or exposed every day. Pay attention to repairs to ensure warmth and warmth. 3. To cover the grass rattan before the advent of cool winds, fix the ropes to prevent the film from injuring the seedlings.
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1. Solar panel: The solar panel is an important part of the mobile phone software of the solar power generation system, and also a part of the practical value of the mobile phone software of the solar power generation system. Its function is to convert the professional ability of radioactive substances in natural light into electric energy, or send them to storage batteries, or promote load work.
2. Solar controller: The solar controller is used to control the operation of mobile phone software in all systems, and has the functions of overcharge protection and overcharge maintenance for the battery. In areas with large temperature difference, the qualified controller shall also have the function of temperature compensation. In the mobile phone software of the solar road lamp system, there must be light control switch and time control solar road lamp operation.
3. Battery: generally valve controlled maintenance free lead-acid battery. In the mobile phone software of small and medium-sized systems, in cold weather areas, a solar gel battery needs to be configured, which can be used at low temperatures, with high efficiency and is not vulnerable to major damage. Its function is to store the electric energy of the solar panel when the sun shines, and then release it under certain conditions.
4. Variable frequency power supply: split wave type and sine wave type. In order to provide power for 220VAC electrical products, it is necessary to convert the DC stabilized voltage power supply in the solar power generation system software into AC circuit energy, so DC AC variable frequency power supply is required.
The prevention and treatment of acute atrophy of cucumber in greenhouse
In the greenhouse, some cucumber plants suddenly became acutely atrophic. The melon farmers were often puzzled and had to plough and change crops. In fact, this acute atrophy of cucumber is a physiological disease.