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 acute atrophy of cucumber has a rapid onset and is difficult to control. The cause of its formation is:
Weather problems, persistent rain or snowfall, snow and snowfall, rapid inversion resulted in rapid seedlings; wind problems, cucumber into the flowering and melon period, sunny high temperature, large amount of air, fast leaf transpiration, some plants with poor hair roots began to shrink, serious The whole plant withered withered withered; cold damage or frost damage caused the surface of the greenhouse membrane to be partially damaged, cold winds plunged into the cause of wilting dead seedlings; excessive fertilizer concentration, especially the application of chemical fertilizer near the base of cucumber stems, could easily burn dead seedlings.
In places where greenhouses are used for cultivation, acute atrophy of cucumber occurs to varying degrees every year. The following measures should be taken for early prevention.
1, due to the amount of water when the seedlings.
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, reasonable control of the temperature inside the shed.
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 timely adjust the temperature and control the temperature, its role are: to prevent the occurrence of diseases; to avoid plant aging; 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.
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