Prevention and control measures of abnormal growth of onion

Onion, also known as from scratch, onion, is a common vegetable in our life, which not only has high nutritional value, but also can prevent and cure the symptoms of osteoporosis, but also has the effect of anti-cancer and anti-aging. it plays a certain role in health care for hypertension and cardiovascular and cerebrovascular diseases. Abnormal growth often occurs in the process of planting, so how to prevent abnormal growth of onions? Let's get to know it with the editor.

1. Strict selection of varieties

In production, it is best to use the excellent local varieties, so that the planted onions can be guaranteed, and if introduction is needed, the introduced varieties should respond to the length of low temperature and sunshine as much as possible according to the strict requirements for low temperature. Good varieties are the premise of high yield and high quality. in addition, seeds should be strictly selected and carefully selected to cultivate strong seedlings before planting.

2. Choose the appropriate sowing time.

In addition to the vernalization type of onion, sowing prematurely will cause the seedling age to be too long and the seedling too large, exceeding the critical size needed for vernalization, and it is very easy to appear the incomplete information of vernalization or vernalization, resulting in abnormal bulb growth. Therefore, according to the characteristics of varieties and climate, the correct sowing time should be from September to October in autumn and from March to April in spring.

3. Strengthen the management of fertilizer and water

Fertilizer and water have a great effect on the growth of onion. If there is too much irrigation and too much nitrogen fertilizer, the seedlings will be too large and the formation of bulbs will be delayed or inhibited. Therefore, we should pay attention to the application of phosphorus and potassium fertilizer and avoid partial application of nitrogen fertilizer, so as to avoid the phenomenon of late growth of aboveground parts and delay of bolting and bulb expansion. Spring sowing seedlings need to keep the soil moist, watering frequently and ploughing lightly before and after they are unearthed. The period of vigorous leaf growth and bulb expansion is the period of the greatest demand for fertilizer and water for onion. It should be irrigated and fertilized at the right time. Diammonium phosphate is 15 kg per mu, diammonium phosphate is 20 kg, and potassium sulfate is 5 kg.

4. Pest control

The main prevention and control is the harm of maggots. Dimethoate and dichlorvos can be irrigated with water, and the use of raw manure as fertilizer is prohibited. Because maggots have a tendency to raw manure, fully mature organic fertilizer should be used, evenly and deeply applied, and seeds are separated from fertilizer. Plots that have been damaged by maggots should be watered frequently and flooded if necessary, but irrigation should be coordinated with the growth of onions.

The above is an introduction to the prevention and control measures of abnormal onion growth. I hope it can help you. If you want to know more about it, please follow us.