What s the matter with green onions that keep rotting roots? Why do the roots of green onions rot

There are several main reasons for the rotten roots of green onions:1. If there is too much water, the formation of water in the soil layer will lead to the phenomenon that the root system of the plant will have difficulty breathing and thus rot.

2. When the soil is compacted or clay, it will affect the normal growth of the plant, resulting in rotten roots and yellow leaves.

3. When too much fertilization, excess nutrients will lead to root burning and root rot.

4. Abnormal temperature will also lead to rot of onion roots.

1. The normal planting time is around September or March in the first half of the year, avoiding the hot and rainy period, otherwise it is easy to grow maggots.

2. Long-term moisture of the soil is easy to transmit rot disease.

I don't know if it's planted in **?

Potted plants should control water, and ground plants should be ditched to do long drainage.

Filling fungicides. Easy to prevent and difficult to treat green onion soft rot.

These days, Pingdu City.

Farmers in Zhanggezhuang and Renzhao towns reported that the green onions they planted were rotting disease. The green onions first rot from the roots, and then the whole plant appears rotten, accompanied by a foul odor. Based on the situation reported by the farmers, the author conducted an on-the-spot investigation.

After field inspection, the root rot of green onions is a typical soft rot.

Green onion soft rot is a bacterial disease, and the pathogen mainly parasitizes the body of the diseased plant and the soil. The suitable growth temperature of the fungus is 25 30 . Therefore, high humidity, heavy crop plots, and low-lying areas are more likely to develop the disease.

Diseased residues, soil, and unrotted fertilizer in the field of green onions are the sources of soft rot, and the pathogens can be transmitted through irrigation, field management, and insects, wind, and rain. Green onion soft rot is easy to prevent, but once it occurs, it is difficult to find the best of the best.

1.Disease-resistant varieties were selected and the seeds were disinfected. It can be soaked with 72% agricultural streptomycin sulfate for 3 5 minutes, sown after drying in the shade.

2.Choose the right plot. The selection of high-dry, well-drained, and preferably unplanted green onion plots in recent years can effectively prevent and control the occurrence of green onion soft rot.

3.Reasonable crop rotation and intercropping. Green onion crops can be rotated with wheat and corn for more than 3 years to reduce the source of bacteria.

4.Proper fertilization. Apply more organic fertilizer, rational application of nitrogen fertilizer, heavy application of phosphorus and potassium fertilizer, and appropriate supplementation of trace elements.

Achieve balanced fertilization, promote the healthy growth of green onions, and improve the disease resistance of plants.

5.Remove disease and residues from the field and disinfect the soil. For plots with severe disease for many years, quicklime can be sprinkled.

or Dixon. The amount of quicklime is 50kg mu, and the dosage of Dixon is 1 2kg mu.

6.Pharmaceutical prevention and control. At the beginning of the disease, spray 500 times of 77% killable wettable powder, or 4000 times of 72% agricultural streptomycin sulfate wettable powder, or 200 times of 70% dixone wettable powder, and the roots can also be irrigated with water.

Depending on the condition, the pesticide was applied once every 7 10 days, and a total of 2 3 times were prevented.

There are many reasons for the rotten roots of green onions, mainly including: 1. Continuous cropping and heavy cropping. 2. There are maggots at the roots. 3. Pollution of water source for watering onions. 4. Herbicide damage. 5. Stagnant water roots.

Symptomatic **1, if the stubble is heavy, use rotation with other crops (note that it cannot be rotated with garlic and leeks of the lily family at the same time). 2. If the root maggot is harmful, use the method provided on the first floor to control it with insecticides such as phosphine granules and chlorpyrifos particles. 3. If the water source is polluted, then use clean water to water the ground.

4. If herbicides are harmful, choose safe herbicides to avoid pesticide damage. There is no special way to strengthen water and fertilizer management and promote seedlings to be strong. 5. If the roots are soaked due to stagnant water, it is necessary to drain the stagnant water in time after the rain.

FYI!

1. Root irrigation treatment.

If the onion has rotten roots, it may be that the plant is suffering from root rot, and the onion can be irrigated at this time. First of all, you can go to the market to buy the first root rot agent or beneficial bacterial fertilizer, and then mix it with water evenly, and use the root irrigation tool to directly provide the agent or fertilizer to the root of the onion to help the plant resume growth.

2. Dig out the diseased plants.

If the root rot is severe, the diseased plants need to be dug out of the soil and burned, and then sprinkled with quicklime on the area where the diseased plants are planted to destroy the bacteria in the soil.

3. Spray the agent.

If the symptoms of root rot are mild, you can spray carbendazim solution on the plant to eliminate the bacteria on the plant, or you can water chlorothalonil solution to the soil to eliminate the germs in the soil so that the green onion can resume normal growth. In the process of using the agent, it is necessary to pay attention to the concentration of the agent to avoid the damage of the onion.

4. Later maintenance.

In the later stage of onion maintenance, it is necessary to water it with mineral-rich natural water to soak all the soil, and it can also provide well-rotted farmhouse fertilizer for the onion to improve the growth rate of the plant. In order to avoid root rot on green onions, in the process of planting, it is necessary to choose rotation soil for planting, and before planting, it is also necessary to prepare the land and fertilize.

If the shallots are rotten, then cut off their rotten roots, and then let them dry for two days before replanting them in that kind of good soil. To sterilize it, expose the soil to the sun.

The tips for planting onions without rotting the roots are as follows:

If you want to plant onions without rotting roots, you can take the form of rotation planting, that is, rotate crops every three years to ensure that the nutrients in the soil are sufficient, and you can also choose loose soil and good drainage soil as the base soil when planting, and you can also strictly control the amount of watering in the process of maintenance to avoid water accumulation of plants.

The main reason for planting onion and rotten roots is heavy planting, which can be planted in rotation, generally once every three years, so as to avoid the phenomenon of rotten roots.

After the green onion is ripe, the leaves rot, mainly caused by the infection of the green onion soft rot bacteria. Onion soft rot is one of the common diseases of green onions, which mainly affects onions cultivated in the open field. Summer and autumn are very harmful in the years of high temperature and rain.

Pathogens can overwinter in bulbs or saprophyte in soil. It spreads through fertilizer, rainwater or irrigation water, and invades through wounds.

Green onion planting management:

Moisture content. Green onions are very drought tolerant, but due to weak root systems, they need to reach 70-80% soil moisture and air humidity.

It is beneficial for growth when it reaches 60 to 70%. Green onions have low requirements for light, so they are suitable for dense planting.

In terms of soil nutrition, green onions drain well and grow well in deep and fertile loam, and in the whole growth process, green onions should be mainly nitrogen fertilizer, and more phosphorus and potassium fertilizers are needed after growth.

In the selection of seedling land, green onions are taboo and continuous cropping.

The vegetables are planted together, and do not choose barren grassland, otherwise the seedlings are overgrown with weeds.

After the harvest of the stubble crop before the green onions, vegetable farmers need to deeply turn and dry the white green onions twice for 20 days. The seedling period of green onions is as long as 50 days, so it is appropriate to apply green water-soluble fertilizer with a small amount of the principle of many times.

The rotten roots of green onions are mainly caused by five reasons, and it is necessary to prescribe the right medicine to promote the healthy growth of green onions. Avoid continuous cropping and rotation with other crops; Provide clean water for watering, and water the right amount to prevent water accumulation in the roots; To do a good job in pest management, it is necessary to spray safe herbicides and chemicals in an appropriate amount to promote their strong growth.

Many people don't know what is going on with the rotten roots of green onions, but in fact, heavy cropping is one of the important reasons for their rotten roots. The planting of green onions in the soil is carried out one after another, and the soil is not disinfected and sterilized in time, resulting in a variety of pathogens, and the soil compaction is difficult to breathe, which is easy to lead to green onion root rot.

Therefore, it is necessary to do a good job of soil renovation and cultivation in time, so that the soil becomes soft, so that the roots of green onions can breathe well in the soil, so that it can grow healthily. It should also be noted that after sowing and harvesting, the soil should be sprayed with liquid to disinfect to prevent the breeding of bacteria from affecting the health of the green onion roots, and crop rotation should be carried out.

Green onions need to be watered in time during the growth process to ensure that they have sufficient water for growth. If the water quality of watering green onions is polluted, it will carry germs into the soil, so that the roots of green onions will begin to rot, so it is necessary to ensure that the watering water source is clean and hygienic.

In addition to the water quality mentioned above, overwatering can lead to water accumulation in the roots of green onions, which can also lead to root rot. In the process of daily maintenance of green onions, it is necessary to water in an appropriate amount to keep the soil moist, generally need to be watered every day, and pay attention to drainage in the rainy season.

When the root of the green onion suffers from root rot, anthracnose and other diseases or root maggot and other insect pests, it will also cause the root rot of the green onion, and the prevention and control of pests and diseases should be carried out in time. Phosphine particles can be sprayed to kill root maggots, and carbendazim solution should be sprayed in time for sterilization and disinfection for diseases.

Weeds often grow next to green onions, and many people choose to spray herbicides in order to prevent the nutrients and moisture of green onions from being consumed. However, if the medicinal ingredients of the herbicide are too large and too concentrated, it will lead to pesticide damage and rot the roots of green onions. It is necessary to choose a safe herbicide, and water and dilute the solution in time after the pesticide damage occurs to make it thrive.

<> rotten roots of green onions are generally caused by soft rot. **Method: Remove the diseased residues in the field, carry out soil disinfection, and sprinkle raw stone jujube to sell quiet ash or dixon for many years of serious disease, the general quicklime dosage is 50 kg per mu, and the dosage of dixon is 1-2 kg per mu; In the early stage of the disease, spray 77% of the killable wettable powder (500 times stool residue liquid) and other drugs, spray once every 7-10 days, and spray 2-3 times continuously.