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Hebei Tong Pu metal wire mesh Manufacturing Co., Ltd.

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Technical

What is the real cause of the disease in the rice seedbed?

Release date:2018-06-18 Total browsing:

    Common diseases of rice seedbeds are bacterial wilt and bacterial wilt. However, the incidence of standing blight is relatively early, and the measures to prevent disease can be eliminated. Therefore, the present disease is not common or can not be seen, but the incidence of bacterial wilt is late, usually between the two leaves and two leaves, at this time, the distance between the sowing time has been nearly 20 days, and the efficacy of the fungicides in the strong seedlings is basically lost.

    At this time, the seedlings will get sick. We will always feel that it is weather, strong seedling agents, acid regulation, sterilization and so on.

The problem. But is it really true? No, according to the actual diagnosis of these fields, the analysis of the phenomenon of green and dry in recent years has come to the conclusion. All the occurrence of the phenomenon is not the following:

    First, pathological blue and dry is the cause of the disease because of the infection of roots by bacteria.

    Second, it is physiological dehydration. This is not caused by bacteria, but because of sudden rise after low temperature.

The seedlings suddenly roll the leaf, and the symptom of blight occurs.

    Third, the bed soil structure is unreasonable, and when the two leaves are in one mind, the whole or continuous leaf rolls are withered.Fourth, wind damage, that is, before planting, exposing the greenhouse film, appear dry together, first from the tip of the leaf, mild symptoms.The leaves are withered, the whole plant is withered, and they grow into pieces on the seedbed. These four situations occur at different times and under different conditions. But in the final analysis, the poor quality of the seedlings is caused by the poor quality of the seedlings.

Analysis of the first point: there are three kinds of pathogens to disseminated seedlings, Fusarium (soil moisture below 50%).

Rhizoctonia solani (disseminated condition soil moisture 50-70%); mold (disseminated condition soil moisture 70-100%). The mold is divided into mycillium and Pythium, and the position of the rhizome and the surface of the rhizome and the surface of the soil are asbestos with white mycelium, and about 0.5-1 cm under the soil surface is a gray green mold. These bacteria are weak parasitic bacteria. The so-called weak parasite is disseminated when the root resistance is low, and the healthy roots are not likely to be disseminated. In 2017, the diagnosis of nearly 500 seedbeds was all infected with mold mold. Such seedlings will continue to die in Honda.Second point analysis: physiological dehydration, rice radicle and nodal roots grow normally at 15-40 C, at low temperature.At 15 C or above 40 C, growth stagnation occurs. When the temperature of the seedling bed is higher than 40 C, the root growth is not good, the root quantity is obviously insufficient, the ventilation is not smooth, the transpiration of the leaves is not strong, the seedlings can not show the phenomenon of green blight. With the increase of ventilation or the sudden opening of the shed, the transpiration water will be more water than the root system, and the green blight will be produced. . Because of the lack of oxygen, the root and root growth of the root and root are seriously hindered by the lack of 

oxygen for a long time. When the temperature is lower than 15, the root function is lost. At this time, the transpiration of the leaves does not stop, and some seedlings will appear green and dry. At this time the green blight will be mixed with pathology, and the main diagnosis should be found. See whether there is a mold in the root. Will the seedlings be broken off from the root knot? The occurrence of this phenomenon is accompanied by pathological bluish dry.

Third point analysis: bed soil is too loose, we normally grow seedlings, and the ratio of bed to soil size is 1:4.Bed soil can guarantee adequate water supply and ensure oxygen supply, which is commonly referred to as water vapor coordination. If there are more pores in the bed, there will be drought. Another phenomenon is the carpet type plate, the bottom and the bed combination is not strict, in the two leaf after the heart, transpiration water, root absorption in the soil water supply is not enough and the emergence of green blight. This kind of blight often does not have pathological features, and the symptoms are serial appearance, which usually occurs between 10 a.m. and 3 p.m. and can be temporarily restored after pouring water.

    Fourth point analysis: leaf and shoot growth is too vigorous, root development is not enough, although there is no pathology.Sexual blight and other symptoms, but if there is more than 4-5 levels of wind when transplanting, the water pressure in the upper part of the seedling is seriously decreased, the water evaporation in the body is filled to fill the water pressure in the air of the seedling layer, and there will be a large area of dry dead seedlings without the cover.

   To sum up, in order to prevent and cure green and dry wilt fundamentally, we must start with the mechanism of the occurrence of drought and drought, and achieve the real goal.Dry raising seedlings, from the beginning of the bud to create the conditions to cultivate the strong seedlings, the quality of the seedlings, the bacteria can not parasitism, root water absorption capacity will be greatly enhanced, all the green blight will not happen.


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