How to grow green onions?

The harvest time and method of green onions depend on different planting seasons, different varieties and different supply and marketing time. Seedlings sown in autumn are planted early and are generally supplied to the market with fresh onions. The harvest period begins in September and they are supplied to the market one after another. Spring-sown and planted green onions are usually produced as winter onions and harvested in early winter (165438+1early October). As a fresh green onion, it has green leaves, tender white leaves and high water content. Generally speaking, it goes on the market with the harvest, rather than being stored as an overwintering onion. The emphasis here is on the harvesting and storage of overwintering onions.

After entering the first first frost solar term, the temperature dropped sharply, the root system lost its function, and the leaves gradually lost their photosynthesis. When the temperature reaches 8 ~ 10℃, the growth of green onions basically stops. The water content in the leaf tube decreases. The mesophyll gradually becomes thinner and droops, which is the harvest season of dried onions. In "The First Frost in the North", these growth conditions are exposed, nutrients return, and green onions gradually soften. This is the truth of the agricultural proverb "the first frost doesn't grow onions, and the longer it grows, the more empty it becomes." However, in actual production, onions can't be harvested in winter, because the temperature is still high at this time, and it is easy to be heated and rotted after stacking, and it is not easy to preserve; In addition, after the temperature of onion is gradually reduced, the moisture in leaves and onions will be reduced, which is beneficial to winter storage. In North China, it is generally not until the first half of 1 1 that the soil freezes, and the harvest of winter onions begins. The northeast is in the middle of 10.

When harvesting, dig out one side of the green onion ridge alive to expose the green onion, hold the lower part of the green onion by hand and gently pull it out, shake off the soil, stroke off the old leaves, put it in piles, and leave it in the ground for a day or two to make the green onion leaves soft and tight, which is beneficial to storage and transportation in winter. When harvesting green onions, it is not allowed to pull them directly by hand, so as to avoid skin injury and broken stems due to too deep and tight soil. In addition, when harvesting green onions, try to keep the leaves intact, so as to preserve the water content of green onions and reduce rot.

Before harvesting green onions in early winter, you must avoid the frost in the morning. First frost leaves are straight, brittle and hard, which is not conducive to the storage of green onions in winter.