How to grow long onions
The Negi was originally characterized by cold tolerance. So it is easiest to sow seeds around spring, sow before summer and harvest around winter, which is a standard farming model.
Sow seeds into the seedling field or seedling box. When the seedlings are nearly 1 cm thick, bring the seedlings to the field. You should leave a space of 5 to 10 cm between stocks. About a month after planting the seedlings, bring the soil to where the roots have grown and bury it in the soil. At first glance, the inclusions in the soil look like the trunk, but this is called the “sheath” and is part of the leaf. It will turn white as it will not be exposed to the sun. Repeat this 3-4 times and add fertilizer at this time. When the height of the tree is nearly 1m, it’s time to harvest. Let’s dig a long onion. During winter, onions rarely grow, so you don’t need to harvest them all at once.
Plant long onions even in the garden
Long onions can also be grown in a growing platform. Use a potted plant that is about 20 cm deep. I think it is difficult to pull the soil to the stretched part, so using a light shield to block out the sunlight, will be discussed later.
Points to note when planting long onions
Although depending on the variety, the optimal temperature for long-release growth is around 15 to 20 ° C. If the soil temperature exceeds 25 ° C and the temperature exceeds 30 ° C, all varieties will not grow. Well, so be careful when farming in the summer. Also, as long onions like a dry environment, choose a well-ventilated and well-drained field. However, if it dries too much in the first stage of growth, it will be affected, only the closest part like Rakkyo will grow or grow slowly, pay attention not to dry too.
Plant onions with a light shield
“White onions” with long white areas have more white areas (soften) due to the use of a light shield over the sheaths. It takes more than a month to ripen, so it should be counted back from the harvest season. If light can get in, wash the scallions with scissors to prevent scallions from exposure to light.
Different types of long onions
There are many types of scallions, but they can be divided into “Kaga group”, “Senju group” and “Kujo group” according to their shape and ecological characteristics. The Kaga group has high cold tolerance and is grown mainly in cold regions such as Tohoku and Hokuriku. The famous Shimonita Negi belongs to this group. The soft white scallions (white scallions) that you often see in supermarkets are the Senju group. It is a type produced mainly in the Kanto region. In addition, as a soft and less spicy scallion, the Kujo group is often made in western Japan.
Recently, each producer has released several varieties, so you should look for varieties that match the regional characteristics and characteristics of your field on the website or directory.
Onions take a long time to harvest, but you should be happy when they do well. Refer to this article, why do not you try to do it in your garden?
Supervisor: Agricultural Research Organization Tomohiro Yamada Vegetable Research Division
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