Cultivating strong seedlings is the basis for high yield and quality. "The strong seedlings are half-received", only the strong seedlings can achieve the purpose of early maturity, high quality and high yield. However, because the seedlings are sensitive to external conditions and the weather is erratic, seedling abnormalities often occur, which affects normal growth.
Coping strategies for abnormal seedlings:
Unsuccessful emergence
The geothermal line or the fire channel is used to warm the seedlings. When laying the geothermal line, the spacing of the front of the greenhouse is 5cm-6cm, and the spacing of the rear of the greenhouse is 8cm-10cm, so that the bed temperature is uniform.
After sowing, the thickness of the covering soil should be uniform, and cover the mulch on the seedbed to keep the seedbed humidity uniform.
When the seedlings are not clear or there are no signs of emergence, the seeds in the seedbed should be inspected. If the radicle is yellow and rotten at the tip of the radicle, the seed can not germinate properly. Look for the cause, improve the environmental conditions of the seedbed, and immediately replant; if the radicle tip Still white, indicating that it can germinate normally, temperature and humidity management should be strengthened to promote seed germination.
When large and small seedlings appear, the seedlings can be moved to the lower temperature of the front of the greenhouse, and the seedlings are placed near the back wall of the greenhouse to make the seedlings uniform and uniform.
Unearthed "wearing a hat"
The thickness of the covering soil should be suitable, generally 1cm-1.5cm. After sowing, the seedling bed is covered with a layer of mulch, which can heat up and keep the soil moist, making the seed coat soft and easy to fall off.
When the soil is thin or there is crack on the bed surface, it is necessary to spray water properly and cover a layer of moister fine soil to increase the wetness of the soil surface and the friction of the soil on the seeds to help the cotyledons unshell.
For a small number of "caps" seedlings, artificial shelling can be carried out in the morning when the shell is moist and soft.
Root
Improve seedling conditions, maintain proper temperature, strengthen ventilation and dehumidification, dilute soil in a diligent manner, increase permeability; control watering, especially if it is not watered on cloudy days.
If the soil is too wet, it can be sprinkled with some fine dry soil or coal ash to make the bed soil temperature rise as soon as possible.
Multi-layer cover is used to facilitate the heat preservation and the rise of the ground temperature, and temporary warming is carried out in the low temperature continuous rain, rain and snow days.
Burning root
The organic fertilizer used in the production of nutrient soil must be decomposed, and the nutrient soil should be used as little as possible or without fertilizer.
If rooting occurs, the amount of watering and the number of watering should be appropriately increased to reduce the concentration of the soil solution, depending on the condition of the seedling, the sensation and the weather.
Chang Miao
Even in the yin, rain and snow, the opaque cover should be removed to make the seedlings see light.
After the emergence of the seedlings, the night temperature was maintained at about 15 °C. As the seedlings grew, the temperature difference between day and night was gradually increased, and the amount of watering and nitrogen fertilizer application was appropriately controlled, and the 0.3% potassium dihydrogen phosphate solution was sprayed on the foliage.
The seedlings are seeded in time, and the seedling density of the seedlings is generally required to be 10 cm square. If the seedlings are used for nutrition, the seedlings can be thinned.
Stiffened seedling
Strengthen the temperature increase and heat preservation measures, reduce the ventilation volume, and make the seedbed receive more light and increase the bed temperature as much as possible. In areas where low temperature weather often occurs during the nursery season, warm seedbed seedlings should be used.
In the strong seedling stage, the management of fertilizer and water should be watered at the right time.
Pay attention to the proportion of fertilizer in the nutrient soil. The dead seedlings caused by lack of fertilizer can be sprayed with potassium dihydrogen phosphate.
Tripping seedling
The plots with high topography and good drainage are selected as seedbeds, and 200 g of Bacillus cereus is added to each nutrient soil for disinfection.
Strengthen the management of the seedbed, do a good job of heat preservation and ventilation, do not water the rainy days, keep the seedbeds dry and not wet.
Chemical control: The diseased seedlings were found to be sprayed with 20% carbendazim and 72.2% of chlorpyrifos 1500 times in time; and the germination of the soil to the seedbed was carried out in the morning when there was no dew on the sunny day. The effect was good.
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