Root vegetables in the seedling stage are a physiological disease, mostly caused by improper management. At the beginning of the hair, there was rust on the roots. When it was severe, the roots rotted, and the new roots did not grow. The seedlings became yellow and wilted, and all died later.
1. Keep the temperature of the bed soil preparation reasonable, and ensure sufficient soil temperature after sowing to seedling stage. In case of rainy weather, when the light is insufficient, measures should be taken to increase the temperature and keep warm. It is best to raise seedlings in the shed (room) by electric hotbed in autumn and winter to facilitate heat preservation.
2. Timely dehumidification When planting seedlings in protected areas such as greenhouses or greenhouses, the general seedbeds are not obviously dry (when the topsoil is not held), they should not be watered or watered as much as possible; Not too big. In the seedbed, do not wet, if the seedbed is too dry, cover the moist fine soil, which can alleviate the water demand of the seedlings and reduce the air humidity in the seedbed. The humidity in the bed is too large, it can cover the hay wood ash, and it can also be properly ventilated and dehumidified at noon at a higher temperature.
3. Before adding light to raise seedlings, it is necessary to choose a place with sufficient light to build a seedbed. This is conducive to the robust growth and development of seedlings, enhance their disease resistance, and reduce the occurrence or spread of roots in vegetable seedlings.
4. Applying farmer's fertilizer to vegetable seedlings, it is necessary to increase the application of farmyard manure, especially hot fertilizer, which can not only fertilize soil fertility, cultivate strong seedlings, improve the disease resistance of vegetable seedlings, but also increase the ground temperature and reduce the occurrence of diseases. The specific method is: before the vegetable seedlings, the fully fermented hot farmyard manure is mixed with the bed soil. However, it is necessary to use decomposed hot farmyard fertilizer, otherwise it will cause root burning.
5. Timely ventilation After the cotyledons are unfolded, choose a warm and sunny weather to uncover the ventilation of the cover, and evenly apply a layer of fine dry soil to the seedbed, and then cover the cover tightly, which can reduce the humidity of the bed soil and have certain Warming effect.
6. Apply rooting agent to root solution 50ml diluted 10~20 times, mix in 50kg nutrient soil or 4~5 square meters seedbed, then seed. It can promote seed germination, uniform emergence, and no weak seedlings. Seedling use: In the seedling stage, that is, after 2 leaves and 1 heart, the seedling bed per square meter is sprayed or sprayed with 30 times of rooting agent 30 times liquid, which can obviously promote the elongation and thickening of the main root, and the lateral roots occur more and strengthen. Root vitality and absorption intensity, avoid rotten roots and form strong seedlings. (Jia Youjiang)
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