Recently, there have been many rainy days and low temperatures. Many vegetable farmers who grow beans and vegetables have called to report that the problem of red roots is prominent. Most of the plants began to appear yellowing and thinning from the lower leaves, and gradually developed upwards. The stems of the plants were weak. When the plants were pulled out, the roots were reddish brown and the capillary roots were few. In severe cases, the plants died and died.
Where is the root cause of red root?
First, physiological problems
1. The ground temperature is too low
The occurrence of red roots in legumes occurs when the temperature is low, and the optimum temperature conditions for the growth of legumes are 22-25 °C. In general, the current daytime soil temperature is 5-7 °C lower than the temperature, and the nighttime soil temperature is 2-3 °C higher than the temperature. If it is even cloudy, the temperature in the shed is only 18-20 °C during the day, and the ground temperature is lower. If it is severe, it will cause discoloration of the roots.
2. Roots
Watering is too large, especially when it is cloudy, the damage to the roots is very large. It is one of the reasons why the ground temperature is difficult to recover. The moisture content in the soil is large, which will inevitably lead to less air and lack of oxygen. It is difficult to meet the root respiratory needs, which may cause the roots of the beans to be injured and the roots to occur, leading to discoloration of the roots.
3. Burning roots
There are many cases of root burning, and the most common occurrence is that the organic fertilizer is not decomposed, and the fermentation continues in the soil, releasing a large amount of harmful gases and heat. Excessive or unreasonable fertilizer application can also cause root burning. When rooting occurs, the capillary roots are firstly victimized, and in the worst case, the entire root system is damaged.
Second, disease infection
Root rot
The occurrence of legume root rot can also cause red roots to occur. After colonization, it is the peak of the disease. The diseased part produces brown or reddish-brown spots. Most of the lateral roots spread to the main roots, and the entire main root is rotted and necrotic. In the longitudinal section, the vascular bundle is red. Brown, the disease extends after the disease extends. When the humidity is high, the diseased part produces pink mold.
2. Anthrax
Anthracnose usually has fusiform or long strip-shaped lesions on the stalk above the surface of the earth. It is initially purple-red and then fades.
　
Prevention
In order to prevent red roots from the newly planted legumes, management should be strengthened from colonization.
The first is to raise the ground temperature. In order to promote root growth, soil temperature should be increased as much as possible. The mulch film, rice husks, straws, etc. can be used to increase the soil temperature.
The second is the filling of the medicine. After the beans are planted and slowed down, it is recommended to use 75% atoine 500 times solution or 30% carbendazim 1500 times solution or 25% bromobacillus 500 times solution and 72% streptomycin sulfate 1500 times solution mixed with rooting agent. Rooting. When filling the roots, be careful to use the de-headed sprayer to fill the roots along the stems at the position above the cotyledons, so as to prevent the disease at the base of the stem.
The third is to pay attention to watering and topdressing. It is best to first water the beans before planting in winter, and increase the ground temperature in advance to help slow down the seedlings. After the seedling water is released, before the first inflorescence is flowered and placed on the pod, try not to water it. If the soil is very dry, you can lick the small water and avoid flooding. In the selection of flushing fertilizer, it should also be noted that in order to promote the growth of capillary roots, rooting fertilizers such as alginic acid, humic acid and chitin should be used together with fully water-soluble fertilizers such as Shunxin and fertility potassium to improve root activity.
The fourth is to raise the leaves to promote rooting. The so-called roots rely on leaf cultivation. If the roots are strong, leaf maintenance is also very important. It can be applied to chitin, chitosan and full-nutrient foliar fertilizer, supplement leaf nutrition, improve leaf resistance and increase photosynthetic product accumulation. Conducive to the growth of the lower roots.
The fifth is to remove the diseased plants in time. For the diseased shed, the diseased plant should be removed as soon as possible, and the surrounding area of ​​the planting hole should be disinfected with the agent, and then the surrounding area of ​​the diseased planting point should be raised to avoid the passage of the diseased area during the watering, and the pathogen can be reduced with water. probability.
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