Key Technical Points and Precautions for Winter Management of Welsh Onions
Welsh onions have excellent cold tolerance and heat resistance, so they can be planted all year round. It is now winter, which is also a period of intensified management for winter Welsh onions. In order to help Welsh onions grow better in winter, and to help growers manage their planted Welsh onions better in winter, we will introduce the winter management techniques for Welsh onions in detail below. Let's take a look.
1. Water in a timely manner
After Welsh onions are transplanted, they should be watered immediately. The first watering should not be too much, so as not to collapse the onion furrows and cause the seedlings to lodge or the root system to rot. After another 5-7 days, water once to help the seedlings recover. After that, water once every week to keep the soil moist. Each watering should not be too much. In addition, after heavy rain, drain water in a timely manner to avoid root rot caused by water accumulation. After Frost's Descent, reduce the watering frequency to once every 10-15 days. Before the winter freeze, water once with freeze-up water. The freeze-up water should be sufficient and thorough to raise the ground temperature and increase the Welsh onions' cold resistance and freezing tolerance.
2. Topdress at the right time
Welsh onions generally need topdressing 3 times in winter. The first topdressing is after the seedlings recover, when the seedlings begin vigorous growth. Apply 8 kg of urea and 8 kg of ternary compound fertilizer per mu. When fertilizing, it can be applied between the rows or broadcast, and can be combined with watering to speed up fertilizer absorption. The second topdressing is before Frost's Descent, and likewise 8 kg of urea and 8 kg of ternary compound fertilizer can be applied. The third topdressing should be before the freeze. Apply 20 kg of urea and 20 kg of potassium fertilizer per mu. At this time, applying potassium fertilizer has an obvious yield-increasing effect. In addition to topdressing, foliar spraying should also be carried out. Low-concentration solutions of ferrous sulfate, ammonium molybdate, copper sulfate and manganese sulfate can be sprayed, which can increase yield by more than 10%.
3. Hilling
After each fertilization, water once and hill the soil once. This can increase the ground temperature and promote root growth. The hilling height should be such that it does not bury the heart leaves, and it should not exceed the branching point of the Welsh onion. Push low, not high. When hilling, pay attention to the soil moisture content. It should be done when the soil moisture content is moderate and there are no mud clods. Also be careful to avoid times when there is dew in the morning. Do not damage the plants when hilling, so as to prevent pathogens from entering and causing diseases.
The above is an introduction to winter management techniques for Welsh onions. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.