Root retting causes and control methods of bean retting

Soybeans retting root is a kind of physiological disaster, which occurs in many areas, and it also brings large economic losses to farmers, so it is necessary to control bean retting roots in time. So how should farmers deal with bean retting? With the editor to learn about bean retting root related knowledge, I hope it can help you.

1. Occurrence of symptoms

Soybeans retting roots often occur in the early stage of seedling development, and almost all vegetable seedlings will be damaged, especially in early spring, especially when the seedling techniques are extensive and the seedling bed is poor in the field. After root retting, the seedlings will not send new roots for a long time, there are few or no adventitious roots, and the original roots will turn yellow and brown and rot gradually. In the early stage of root retting, the leaves of the seedlings became thinner, withered during the day after sunlight, the leaf margin scorched, the plants gradually withered, and the diseased seedlings were easily pulled out from the soil.

2. The cause of disease

There are many reasons for bean retting. First of all, the content of soil organic matter in the seedbed is low, and the growth and development of the root system is slow. In addition, when the soil is too wet, the root system will be suffocated by hypoxia. At the same time, temperature is also extremely important. when the soil temperature of the seedling bed is lower than 12 degrees for a long time, it even exceeds the tolerance limit of the roots, making the roots gradually turn brown and rot until death. In case of continuous rain and snow angels, lack of light and low temperature hinder the development of weeds in the root system, resulting in retting roots. In the application of rotten organic fertilizer, the bed soil is unevenly mixed with fertilizer, and the fertilizer is in direct contact with the root system, resulting in burning seedlings and retting roots.

3. Prevention and control methods

The plots with high topography, good drainage and north leeward to the sun should be selected as low seedling cultivation, and the seedling bed should apply more organic fertilizer with phosphorus and potassium fertilizer to ensure sufficient soil organic matter and promote root growth. After the seedlings are unearthed, we should pay attention to the weather changes and do a good job of ventilation. We can spread dry fine soil or plant ash to reduce the humidity of the seedling bed. In order to do a good job of heat preservation, we can cover the seedling bed with double-layer plastic film and cover the grass curtain at night. if the field permits, we can cultivate strong seedlings by means of ground hot line, nutrition plate, nutrition bowl and so on.

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