What are the key points of spring management techniques for onions?
Onion cultivation is still very common in our country, because of its good taste and rich nutritional value, it is also welcomed by many people. The generally suitable sowing period for onions is around September, but now that planting techniques are increasingly advanced, onions can also be planted in spring. So how should onions be managed when planted in spring? Today the editor brings you the spring management techniques for onions, let's take a look below!
1. Scientific fertilization
In spring, after the onions turn green again, we should begin fertilizing. This is mainly to provide sufficient growth nutrients for the onion roots and to lay a foundation for the later growth of the aboveground part of the onions. When fertilizing, pay attention to choosing the right fertilizer. The fertilizer is generally based on decomposed farmyard manure, and then attention should also be paid to controlling the amount applied. Generally, about 1000kg is applied per mu, along with an appropriate amount of superphosphate and potassium sulfate and other fertilizers. If planting with plastic film mulch, then applying an appropriate amount of ammonium sulfate or potassium sulfate per mu is sufficient.
When the onions grow 9 true leaves and the bulb also begins to expand, the bulb-promoting fertilizer should be applied. Generally, it should be applied about three times in succession, with ammonium sulfate as the main fertilizer, keeping the amount at about 15kg per sq m. In the mid-stage of onion bulb expansion, this is the key period for onion fertilization, and at this time a relatively large amount of fertilizer should be maintained. Then when the onion bulb begins to expand, attention should be paid to controlling the application of nitrogen fertilizer to avoid excessive vegetative growth in onions. Finally, during the bulb expansion period, an appropriate amount of potassium sulfate should be added; if onions lack potassium, then their storage tolerance will decline as a result.
2. Timely watering
In spring, we should also give the onions an appropriate amount of green-turning water. However, pay attention to the timing of applying the green-turning water; it must not be too early, otherwise it will cause the soil temperature to drop. This is very unfavorable for onion growth, but it also must not be too late, otherwise it will inhibit onion growth and cause the onion leaf tips to dry out. Then when the onion bulb expands, water control and seedling hardening should be done well. The time should be flexibly adjusted according to the soil environment, climate, and the actual growth conditions of the onions. For example, if the soil is clayey and the terrain is low-lying and rainy, then the seedling hardening time should be appropriately extended. This is mainly to promote the expansion and transformation of onions toward the bulb, and it takes about ten days.
When planting onions, if the color of the mature tubular leaves of the onion begins to turn dark green, and the leaf flesh is thick and the waxiness of the leaves begins to increase, then the seedling hardening can basically be ended. After the onion seedling hardening period ends, water about once every five days, mainly to promote the expansion speed of the onion bulb. If onion plants lodge, then watering should be stopped. This prevents the storage tolerance of onion bulbs from declining after harvest, which would affect economic benefits.
The above is a brief introduction to spring management techniques for onions. That is all for today's introduction. This article is for reference only, and I hope it can help everyone!