How to manage green onions during high-temperature periods? These methods you need to master
Green onions are one of the most common side vegetables in our daily lives, and they are grown quite widely in every region of our country. When growing green onions, we need to reasonably adjust our management methods according to temperature changes. Especially during high-temperature periods, green onion cultivation management is even more important. So how should green onions be managed during high-temperature periods? Today, the editor brings you the management methods for green onions during high-temperature periods. Let's take a look below!
1. Promote roots and strengthen plants
If green onions enter a high-temperature period after transplanting, then the focus of management at this time is promoting roots. Pay attention to watering work, drain promptly during the rainy season to avoid waterlogging damage, and strengthen intertillage management to promote root growth. During the peak leaf-growing period of green onions, the demand for fertilizer and water becomes greater. At this time, the first topdressing should be carried out together with watering. The fertilizer can mainly be urea, about 20 jin per mu, and can also be combined with an appropriate amount of monopotassium phosphate or potassium nitrate. When the white portion of the green onion gradually forms, this is an important period for ensuring yield. At this time, topdress about two times, mainly with nitrogen fertilizer and supplemented by phosphorus and potassium fertilizer, and it is best to keep the soil moist to promote the growth of the white portion.
2. Reasonable hilling
Hilling work is also essential. Generally, the deeper the hilling, the longer the white portion of the green onion will be. Therefore, hilling is the main measure for softening the leaf sheaths of green onions, preventing lodging, and improving yield and quality. Intertillage and hilling work should be carried out when the white portion forms, otherwise it is easy to cause rot in green onions. When hilling, pay attention to appropriately increasing the thickness of the hilling according to seedling age. Especially after the Start of Autumn, it is generally necessary to hill once about every two weeks for about two months. This is the main measure for ensuring the length of the white portion.
When hilling, it should be done in the afternoon, because at this time the leaves of green onions are relatively soft. If done in the morning, the leaves are more tender and fragile, and it is easy to cause leaf damage. Hilling must not bury the heart leaves, so as not to affect the growth of green onions. If the onion seedlings are relatively small, then hill relatively shallowly, and then gradually increase the hilling thickness as the number of hillings increases. Each time, keep it at the exit of the previous leaf. Finally, the hilling thickness should be kept at about 15 cm above the ground. Be sure not to bury the heart leaves, to prevent root and plant rot.
3. Pest and disease control
During high-temperature periods, it is a weakening period for green onion growth, and at this time green onions are very susceptible to pests and diseases. Among them, common ones include downy mildew and phytophthora blight. Disease control is mainly based on early prevention. When transplanting, appropriate pesticide spraying should be carried out for prevention. The pesticide is mainly chlorothalonil, which can be mixed with an appropriate amount of streptomycin, and can achieve effective preventive effects against fungal and bacterial diseases. Then the main pests are onion thrips and leafminers. To control pests, first do a good job of weeding, then use insecticides such as Actara or Caixi for spraying and killing insects.
The above is a brief introduction to management methods for green onions during high-temperature periods. That is all for today's introduction. This article is for reference only, and I hope it can be helpful to everyone!