Onions are very adaptable to the environment and can grow anywhere no matter what variety is chosen, only the final quality and yield are different. In order to avoid root rot, you need to choose the right variety according to the local environment. If you blindly choose high-yield varieties, planting is prone to problems. Scientific planting is the basis for preventing onion root rot. If planting is not reasonable, onions are prone to root rot disease during the growth process, and many problems will also occur. When planting seedlings, make a hole for planting and then plant them upright, not diagonally. At the same time, the planting should not be too deep or too shallow, otherwise the roots will be stunted, not only slow growth, but also easy to rot.

Fertilizer is the key to onion growth. If there is a lack of fertilizer, the nutrients needed for onion growth cannot be met, and the resistance of the onion will be weakened. In this case, bacteria can easily invade and cause root rot. First of all, it is necessary to apply sufficient base fertilizer, which should be decomposed into organic fertilizer, as well as the reasonable use of nitrogen fertilizer, phosphorus fertilizer, potash and other fertilizers. In addition to the base fertilizer, the late stage should also be reasonable fertilizer, to ensure the nutrition of the onion during the growth period. Because the root system of onions is weak, it needs to maintain a certain degree of humidity in the soil. Therefore, onions should be watered frequently when growing, especially in summer. However, the specific watering situation should be determined according to the weather and soil conditions, and should not blindly water more.

If the amount of water is too large, it will also affect the root respiration and lead to root rot. In addition, pay attention to drainage after rain. Water in the field will also produce roots. When planting onions, too much water can easily cause waterlogging in the field, especially harmful sewage will affect the growth of onions. Prolonged accumulation of water in the roots of onions will affect the growth of onions, reduce the resistance of onions to disease, and cause diseases of onions. To prevent and control onion root rot, it is necessary to apply base fertilizer and fully rotted farmyard manure in time, mixed with calcium superphosphate, potassium sulfate and grass ash, sprinkled with copper sulfate and boric acid, and sprinkled into the plow into the soil before onion land preparation, and the fertilizer is fully mixed with the soil. Before planting onions, deep plowing should be carried out in the field, which should be scheduled as far as possible before winter. When transplanting, completely decomposed farmyard manure and microbial fertilizer should be used and mixed well to enhance the disease resistance of onions.