Spring glutinous rice is one of the main mouthwashes of cucumbers in the solar greenhouse, and the phenomenon of dead seedlings often occurs in production. What causes the dead seedlings? What countermeasures should I take?
1. Fertilizer: First, the fertilizer is not fully fertilized, and the second is 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.
2, after the yin and suddenly clear: after the cloudy or rainy days, the sudden clear, will cause the original water shortage of cucumber acute wilting, such as a long time, remedial measures are not timely, 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. 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.
3, unreasonable ventilation: cucumber into the flowering and melon period, sunny high temperature, large amount of air, leaf transpiration fast, some plants with poor roots began to wilting, the whole plant withered water loss.
Countermeasures: The vents should be large to small. Check the shed film for damage or leakage every day, pay attention to repair, and keep warm. Cover the grass before the wind and cool down, lock the rope to prevent cold wind from invading the wound and melon seedlings.
4, chilling or freezing damage: When the temperature is low or the temperature is lower than -10 °C, the cucumber in the solar greenhouse is prone to chilling or freezing damage. Due to the long-lasting winter temperature, the vegetable growers are unable to defend against the low temperature, and the plants die due to cold damage or freezing damage.
Countermeasure: In order to prevent extreme low temperature, the thickness of the back wall of the solar greenhouse should not be lower than the local reasonable value. It can be covered with straw curtain and rain film. The grass curtain around the solar greenhouse can be used in the greenhouse during the seedling period. In the middle of the plus buckle in the small shed, the shed is covered with straw curtains, after the vines can be used to use the fire, charcoal basin and other subsidies to warm.
5, roots: the dead seedlings caused by roots occur mostly in the seedbed or shortly after planting, because the seedlings or cultivated fields are too much watering at one time, the soil moisture is high at low temperatures, the roots are smashed, and the aboveground part stops growing.
Countermeasures: In winter, the ground temperature and temperature are low, and the watering should be a small number of times. Do not flood the water. The temperature is low, the soil moisture is high, and when it is rainy, it is even less or not watered. Into the season of fruiting, you can combine topdressing and watering, water and fertilizer, and apply once every 10 days. Watering should be carried out on a sunny morning, avoiding watering in the afternoon and evening. It is not advisable to water the whole shed in rainy days.
6. Diseases: The dead seedlings of cucumber seedlings in the solar greenhouse are mostly caused by rickets and blight. After colonization, there are many diseases causing dead trees, such as blight, blight, root rot and blight.
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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