Vegetable roots 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.
Prevent the roots of vegetables in the seedling stage to do the following:
1. It is reasonable to maintain the proper temperature of the bed soil. The soil temperature should be ensured after the sowing to the seedling stage. In case of rainy weather, when the light is insufficient, measures should be taken to increase the temperature and keep warm. In early spring, it is best to use an electric hotbed to raise seedlings in the shed (room) to facilitate heat preservation.
2, timely reduction of humidity in the greenhouse or greenhouse protection seedlings, the general seedbed is not obviously drought (the topsoil is not holding the group) without watering, should be less watering or no watering; Not too big. Do not wet in the seedbed. If the seedbed is too dry, it can be covered with moist fine soil, which can alleviate the water requirement of the seedlings and reduce the humidity of the air in the seedbed; if the humidity in the bed is too large, it can cover the hay ash, or at the midday of the higher temperature. Ventilation and dehumidification.
3, pay attention to increase the light before seedlings, 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, the application of farmyard manure vegetable seedlings, the application of farmyard manure, especially hot fertilizer, can not only fertilize the soil, cultivate strong seedlings, improve the disease resistance of vegetable seedlings, but also increase the ground temperature and reduce the occurrence of diseases. Specific practice: Before the vegetable seedlings, mix the fully fermented hot farmyard manure 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 to warm the weather to uncover the cover ventilation, 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, but also have certain The role of warming.
Chlorine-containing preparation is the earliest and most widely used drinking water disinfectant, which is of great significance for carrying out disinfection and ensuring disinfection effect. Chlorine in drinking water
Effective chlorine is a method to characterize the oxygenation capacity of chlorine-containing disinfection liquid with chlorine gas as the standard. The effective chlorine content in disinfectant venom is taller, disinfect ability is stronger, kill
Kill microorganisms more thoroughly. Residual chlorine refers to the residual chlorine content in the water after the disinfectant has been used for a certain period of time. If sufficient residual chlorine is maintained after chlorination of the water,
It shows that not only the disinfection effect is reliable, but also the continuous disinfection effect. This speed test paper is a kind of broad-spectrum chlorine test paper, used to determine the disinfectant
Whether the effective chlorine content reaches the disinfection application value, whether the residual chlorine content in the water can ensure the disinfection effect and whether the concentration is too high and affect the sensory properties of the water is very important
To cause secondary chemical pollution .
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