Roots of vegetables during seedling stage are a kind of physiological disease, which are mostly caused by improper management. At the time of initial infection, rust appeared in the roots. In severe cases, the roots were rotted, and no new roots were found. The seedlings turned yellow and wilted, and all of them died later. The preventive measures are as follows:
First, keep the temperature
Bed soil preparation should be reasonable. After sowing, it should ensure sufficient soil temperature. If it is cloudy and snowy days, when the temperature is low, warming and heat preservation measures should be taken. Winter nursery seedlings (rooms) in the best use of electric hotbeds for nursery, in order to facilitate insulation.
Second, timely humidity
When raising seedlings in shelters such as greenhouses or greenhouses, generally the seedbeds are not significantly watered when the seedbeds are in contact with each other, and watering or watering should be avoided as much as possible. The amount of watering during obvious droughts should not be excessive. Seedlings in the nursery are dry and not wet. If the seedbed is too dry, it can cover moist fine soil. This will not only relieve the seedlings' need for water, but also reduce the air humidity in the seedbed.
Third, increase lighting
Before growing seedlings, choose a place with sufficient sunshine to build a seedbed, or set up a fill light to fill the light. This is conducive to the seedlings robust growth and development, enhance their resistance to disease, reduce the emergence or spread of roots in vegetable seedlings.
Fourth, timely ventilation
After the cotyledon is unfolded, choose clear and warm weather to uncover the ventilation of the cover, and evenly spread a layer of fine dry soil to the seedbed, then cover the cover tightly. This will not only reduce the humidity of the bed soil, but also have a certain warming effect.
Fifth, the application of rooting agents
The rooting agent 50 ml diluted 10 to 20 times, and 50 kg nutrient soil or 4 to 5 square meters on the seed bed can be mixed after sowing, can promote seed germination, emergence consistent. In the seedling stage, that is, 2 leaves and 1 heart, the rooting agent per square meter with 30 times liquid 5 to 10 kg watering or spraying, can significantly promote the main root elongation, bold, more lateral roots, enhance root activity and absorption strength Avoid rotting roots and form strong seedlings.
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