How to prevent and cure the dead cucumber in the greenhouse in winter and spring? Winter and spring are one of the main cornices in the greenhouse, and the phenomenon of dead seedling often occurs in production. First of all, we must consider the fertilizer: first, the application of fertilizer that is not fully decomposed, and second, the concentration of fertilization is too large. Countermeasure: Organic fertilizer must be decomposed by high temperature. Generally, it takes more than 50 days in summer and more than 100 days in winter. Enzyme bacteria can be applied to accelerate the maturity. In the case of a large amount of organic fertilizer application, no fertilizer is applied or planted at the time of planting, and the chemical fertilizer is mainly composed of ternary compound fertilizer, and less single nitrogen fertilizer is applied. Topdressing needs to be more than 10 cm from the seedlings, and watering after topdressing.
Secondly, the sudden clearing after continuous cloudy or rainy days will cause the acute lack of water in the original cucumber. If the time is long, the remedial measures are not timely, and it is easy to cause dead seedlings. Countermeasures: After the rain or heavy snow, it is necessary to gradually see the light, such as the wilting of the seedlings, timely shading and hydration. Foliar spray can be used to supplement 1% glucose water efficiency
Better. In the continuous cloudy day, as long as the temperature is not too low, it is necessary to uncover the grass curtain and see the light. The reflective curtain is mounted on the back wall of the greenhouse to play a certain role in enhancing the light. Remove snow in time after heavy snowfall.
In addition, there are also the causes of diseases. The dead seedlings in the greenhouse seedlings in the greenhouse are caused by rickets and blight. After colonization, the dead trees are more likely to be diseased, such as blight, blight, root rot, and blight. Wait. Countermeasures: Select disease-resistant varieties, do a good job of disinfection of seeds and seedbed soil, and find that the diseased plants are removed from the shed in time, and the surrounding plants are treated.
Blight disease, squatting disease is commonly used 72.2% Plex 600 ~ 800 times liquid or 58% metalaxyl manganese zinc 500 ~ 600 times liquid spray control; blight can be used 72% DuPont gram dew 800 times liquid for leaf spray control; Root rot can be sprayed with 50% carbendazim 600 times liquid root spray; blight blight can be sprayed with 75% chlorothalonil WP 600 times liquid spray; control of blight can be controlled by grafting, 40% DuPont Fuxing or 50% carbendazim roots.
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