What are the latest causes of abnormal onion growth?
Onion, as one of the most common side vegetables in daily life, is very rich in nutrients, containing potassium, vitamin C and other substances. It can prevent cancer and aid digestion, but many diseases occur during onion growth, among which abnormal growth is relatively common. So what exactly causes abnormal onion growth? Let's take a look!
1. Climate reasons
Onion is a biennial crop of the early-spring seedling type; its seedlings only become sensitive to temperature after growing to a certain degree. If cold air or a sudden drop in temperature occurs before the seedlings have grown to this degree, the direction of seedling growth will shift from vegetative to reproductive. If the low-temperature period lasts too long, the onion will vernalize and then flower; if the temperature is too low, it will show partial vernalization followed by abnormal differentiation, leading to the phenomenon of multiple fruits
2. Seed reasons
Different soil conditions and environments call for different seeds; it is generally caused by seeds not adapting to factors such as the soil environment. This is because the low-temperature period and sunshine duration differ from place to place. For example, some seeds with poor cold resistance are very sensitive to low-temperature environments and will flower when the temperature drops even slightly. Seeds with strong cold resistance will only flower after growing to a certain degree, and their adaptability is inferior to that of local seeds.
3. Improper sowing time
Onion is a plant that turns green in spring. If sown in January or earlier, it will affect the growth rate of the seedlings, causing the time to be too long and the area to be too large. If it exceeds the size at which onion vernalization occurs, the phenomenon of failure to vernalize easily appears, ultimately leading to abnormal growth.
4. Nutritional imbalance
This is mostly caused by excessive irrigation, excessive application of nitrogen fertilizer and so on, which can also make onion seedlings too large and hinder bulb formation. Moreover, bolting and flowering can also occur in low-temperature seasons. But if the soil is too dry and there is too little nitrogen fertilizer, the carbohydrate ratio in the onion will increase, and the time of growth and flowering will be advanced, leading to flowering.
5. Other factors
In the field there are generally root maggots, which seriously harm onion growth and cause the stems to grow more slowly. Also, when cultivating, the planting depth should be moderate; too deep or too shallow will directly affect stem growth.
The above five are the main causes of abnormal onion growth, because onion has relatively strict requirements for various factors. Too much or too little will affect onion growth. So in daily care, you only need to pay attention to onion management and the amount of fertilizer and water. To learn more agricultural knowledge, please continue to follow Qinnong Network.