Causes and prevention methods of onion deformity

Onion, also known as onion, onion, is a common vegetable, because of its high economic benefits, the planting area is more and more extensive. However, there will be deformities in the planting process, which seriously affect the commodity value of onions and bring economic losses to farmers, so what is the reason for onion deformities? Let's take a look at the prevention and control methods with the editor to minimize the loss.

1. Seed causes

Onion has been cultivated for a long time, there are many varieties, many areas do not refer to the local environment when introducing, resulting in seeds and local environment causing discomfort. For example, varieties with weak winterness are more sensitive to low temperature. When introduced to areas with low annual average temperature, they will bolt in case of low temperature, while varieties with strong winterness will bolting and blossom only when they feel low temperature.

Control methods: excellent varieties suitable for local environment should be selected for cultivation, and varieties suitable for local cultivation should be selected according to the response of varieties to temperature and sunshine.

2. Climatic reasons

Onion is a typical vernalization type biennial plant of seedlings. When the seedlings grow to a certain extent, they will respond to low temperature. If cold air or low temperature is encountered at this stage, the seedlings will change from vegetative growth to reproductive growth. Over a long period of time, vernalization will occur and cause bolting and flowering, the temperature is too low, the temperature can not be completely vernalization, resulting in abnormal differentiation of bulbs, resulting in growth deformities.

Prevention and control methods: to strengthen the management, we can use the greenhouse method to artificially control the temperature to make it vernalization completely and promote the growth of bulbs.

3. Malnutrition

Partial application of nitrogen fertilizer and excessive irrigation during fertilization will lead to excessive growth of seedlings, inhibit or delay the formation of bulbs, and bolting and flowering ahead of time in the period of low temperature. On the other hand, when the nitrogen fertilizer is insufficient and the soil is dry, the seedling growth is weak and enters the reproductive growth in advance, which leads to bolting and flowering, which will also lead to bulb deformity.

Control methods: fertilization should be reasonable, especially the application amount of nitrogen fertilizer should be controlled, nitrogen fertilizer should be applied in the early stage to promote seedling growth, but it should not be too much, less or no nitrogen fertilizer should be applied in the middle and later stage, and the application of phosphorus and potassium fertilizer can increase the yield.

4. Planting too deeply

In the process of planting, too deep or too shallow will lead to abnormal growth or poor development of the bulb, too deep, excessive leaf growth, thickening of the bulb, too small and deformed bulb; too shallow, the plant is easy to lodge, the bulb may also be exposed to the ground, and the bulb will turn green and dry for a long time.

Prevention and control methods: the depth of planting must be appropriate, not too deep or too shallow, loose soil can be properly deep-planted, soil sticky important and appropriate shallow planting.

The above is the introduction of the causes and prevention methods of onion deformities. I hope I can help you. If you want to know more about it, please follow us.