Causes and control methods of root rot of Chinese onion

Green onions believe that we are not strange, in recent years, its price is stable, the yield is also relatively high, the planting efficiency is still good, but in the planting process will often put its degree of rotting root phenomenon. So what is the cause of the rotten roots of green onions? How to prevent and cure it? Let's get to know it with the editor.

First, the root rot of green onions

There are many reasons for the root rot of green onion. If the herbicide is not used properly, it will cause drug damage, restrict the growth of green onion, yellow and dry leaves and rot the root. After years of repeated cropping, there are many germs in the soil, and serious diseases are inevitable, which can easily lead to root rot and death of green onions. When the soil moisture is high, the permeability decreases, the root can not breathe normally, the stress resistance of the plant will decrease, and suffocation will occur over a long time, resulting in root rot. In addition to disease damage, underground pest damage can also cause root rot, such as root maggots will bite the root of green onions, giving germs the opportunity to take advantage of, which will also cause root rot.

II. Prevention and control methods

1. Scientific planting

When planting seedlings, we should first hit the planting cave, and keep the seedlings upright, not oblique planting, but also pay attention to the planting depth, not too deep or too shallow, otherwise it will not only develop slowly, but also cause poor root breathing. In addition, the planting method of north and south ridges is adopted when planting, which is more conducive to more and more uniform light of green onions.

2. Apply enough fertilizer

Fertilizer determines the overall growth of Welsh onion. If the fertilizer is insufficient, the stress resistance and disease resistance of the plant are weak, and it is very easy to be invaded by bacteria. Fertilization should be based on mature organic fertilizer, supplemented by chemical fertilizer, rational use of nitrogen fertilizer and increased application of phosphorus and potassium fertilizer. On the basis of sufficient base fertilizer, reasonable topdressing, especially in the prosperous period of green onion growth, is the most critical period of green onion yield.

3. Rational watering

Watering green onions should be carried out flexibly according to weather conditions, soil dry and wet conditions, and mid-tillage conditions, and the temperature is higher in summer and autumn, when watering is mainly to promote root development, in addition to abnormal dry weather, minimize watering water as much as possible, and at the same time do a good job of drainage after rain to avoid stagnant water retting roots.

4. Cultivate the soil by ploughing.

It is necessary to cultivate the soil for 3-4 times during the green onion growing period, which can break the soil consolidation, increase the soil permeability, make the root system grow and develop well, and prevent bending lodging. In addition, weeds can be removed when combined with ploughing and soil cultivation, and chemical agents can be used as little as possible. even if they are to be used, there should be high efficiency and low toxicity.

5. Pest control

We must pay attention to the prevention and control of diseases and insect pests of scallions, disinfect and sterilize by deep turning and spreading quicklime before planting, so as to reduce the base of diseases and insect pests, and the occurrence of diseases and insect pests is the right medicine in time to avoid the expansion of losses.

The above is the root causes and control methods of green onions, hope to help you, want to know more related knowledge, please pay attention to us.