What are the causes of abnormal onion growth?
As one of the most common side dishes in daily life, onions are very rich in nutrients, containing potassium, vitamin C and other substances. They can help 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
The onion is a biennial crop of the early-spring seedling type; its seedlings only become sensitive to temperature after growing to a certain size. If cold air or a sudden drop in temperature occurs before the seedlings have grown to this size, 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 seeds suit different soil conditions and environments; 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 only slightly. Seeds with strong cold resistance only flower after growing to a certain size, and their adaptability is inferior to that of local seeds.
3. Improper sowing time
The onion is a plant that turns green in spring. If sown in January or earlier, it will affect the growth rate of the seedlings, resulting in too long a time and too large an area. Once they exceed the size at which onions vernalize, the phenomenon of failure to vernalize easily occurs, ultimately leading to abnormal growth.
4. Nutritional imbalance
This is mostly caused by excessive irrigation and over-application of nitrogen fertilizer, which can also make onion seedlings grow too large and hinder bulb formation. Moreover, bolting and flowering can occur in low-temperature seasons. However, 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 advance, leading to flowering.
5. Other factors
There are generally root maggots in the field, and root maggots seriously harm onion growth, slowing the growth rate of the stem. Also, when planting, 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 onions have relatively strict requirements for various factors. Too much or too little of anything will affect onion growth. So in daily care, you only need to pay attention to the management of onions and the amount of fertilizer and water. To learn more agricultural knowledge, please continue to follow Qinnong Web.