Control of acute dead seedlings in greenhouses In the use of plastic film covering greenhouses in the anti-season cucumber cultivation process, when the cucumber into the fruiting period, often have good cucumbers in the previous period of time, suddenly appeared within a few days of acute dead seedlings. This type of acute atrophy of cucumbers has a rapid onset and is difficult to control. The cause of the disease is: weather problems, persistent rain, or a clear and sunny after snow. Inversion causes rapid death of seedlings; Large amount of wind, rapid transpiration of the leaves, some plants with poor hair roots began to shrink, the whole plant withered with severe water loss; cold damage or frost damage caused the surface of the greenhouse membrane partially damaged, cold winds into the wilting dead seedlings; fertilizer concentration is too large The problem, especially the application of chemical fertilizers near the base of cucumber stems, can easily cause death of seedlings. For early prevention, the following measures should be taken: 1. The dead seedling was watered in due amount. The roots of cucumbers are more developed, but most of them focus on new roots in the soil surface. To avoid watering mistakes and inhibit the growth of root groups, pay attention to the watering of seedlings. Planting water with less water and pouring water back into the seedlings. Low temperatures, high soil moisture, or even rainy weather, little or no water. Into the period of fruiting melons, combined with topdressing, with water, fertilizer, once every 10 days or so, to prevent excessive application of fertilizer once burned melon seedlings. It is better to water in sunny mornings and avoid watering in the afternoon and evening. Rainy days should not be watered in the entire shed. It is necessary to dilute the water and not flood the area. 2. Reasonably control the temperature in the booth. The initial period of colonization is generally not ventilated. It is maintained at 25°C-30°C during the daytime and 12°C-15°C at night and not lower than 10°C. With the growth of melon seedlings, it is necessary to adjust the temperature and control the temperature in time. Its role is to prevent diseases, avoid plant aging and supplement carbon dioxide. However, the regulation of temperature must be conducive to the growth of cucumbers, generally the daytime temperature rises to 30 °C when the ventilation, the afternoon down to 28 °C when closing the film. The temperature during the squash should not fall below 12°C. Often dredge the ditch around the cucumber planted in the greenhouse to ensure smooth flow, so that drainage can be done in a timely manner to achieve rapid water filtration. Every day, it is necessary to check if the shed film is damaged or leaking. Pay attention to repair and increase the temperature of the insulation. Before the advent of cool winds, cover the grass and lock the ropes to prevent the cold winds from invading the seedlings. nebulizer kit,nebulizer price,price nebulizers Shenzhen Urion Technology Co., Ltd. , https://www.urionhealth.com