After the cucumber is colonized, the dead tree phenomenon often occurs because:
First, the cause of death or wilting
1. Fat damage. One is to use fertilizers that are not fully decomposed, and the other is to apply too much fertilizer.
2. After a long period of rain or snow and rain, it will cause acute wilting of cucumbers that are already dehydrated. If the time is long and the remedial measures are not timely, it may cause death.
3. Ventilation is unreasonable. The cucumber enters the flowering and nectar stage, and it is sunny and high-temperature, with a large amount of air release, and the transpiration of leaves is fast. Some plants with poor rooting begin to wilt, while those with severe water loss are withered.
4. Cold damage or frost damage. In case of low temperatures or temperatures below -10°C, cucumbers in greenhouses tend to produce cold or freezing damage. Vegetable farmers often suffer from inadequate preparation due to high winter temperatures for many consecutive years. They are unable to defend against low temperatures, and plants die due to cold or freezing injury.
5. Roots. The phenomenon of dead seedlings caused by roots occurs mostly after seedbeds or after planting. Many of the seedlings or cultivated fields cause too much soil moisture at low temperatures and erosion of the roots, resulting in wilting of the ground and even dead seedlings.
6. Diseases. The dead seedlings of cucumber in the solar greenhouse are mostly caused by damping-off disease and blight, and the disease caused by dead trees after planting is more, such as wilt disease, epidemic disease, root rot, and bacterial blight.
Second, the solution
1. Apply completely decomposed organic fertilizer. Organic manure must be fully fermented and matured, and fertility father can be applied to speed up the maturity. In the case of a large amount of organic fertilizer, no or little chemical fertilizer was applied during colonization, and less single nitrogen fertilizer was used. Top dressing needs to be more than 10 cm from the seedlings, watering after top dressing.
2. After the rain or heavy snow suddenly clear, gradually see the light, such as seedlings wilting, timely shading and replenishment.
3. Increase the amount of light. Clear sunny days as early as possible on sunny days, and often clean the membrane surface in order to increase the light transmittance. Even when there is no light, there is still scattered light. As long as the temperature in the interior of the grasshopper is not significantly reduced, the cucumber must be exposed to light. Another hanging light curtain, using lighting to supplement the light.
4. In winter, the ground temperature and the temperature are relatively low. Watering should be performed in small quantities for several times without flooding. Into the fruiting period, can be combined with top dressing watering, with water fertilizer, pouring once every 10 days. Watering should be watered on a sunny morning, avoid watering in the afternoon and evening.
5. Select disease-resistant varieties and find the diseased plants to pull out of the shed in time and control the surrounding plants.
6. Step up in the winter to pay attention to gradual, do not pull the air outlet is too large.
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