Winter is the peak season for the consumption of leeks. The market demand is large and the supply depends mainly on greenhouse production. The leeks can grow continuously in the greenhouse. The vegetable growers generally adopt more ways to increase the harvest rate to obtain more yields, which will easily lead to weakening of the amaranth growth, declining quality, and even increase the disease. This is because leek is a perennial herb, and the nutritional status of the roots and stems is the basis for the healthy growth and sustained high yield of leek, and the rational harvesting of leek is closely related to the nutritional status of the roots and stems. Reasonable harvesting of leeks can improve the nutritional status of the rhizomes of leeks, which is conducive to the stable and healthy growth of leeks, and ensures the quality and stability of leeks.
Harvest time is appropriate
In winter, the best harvest time interval for greenhouse leek is 30-40 days. At this time, the height of leek plants is generally 30-40 cm, and the number of leaves reaches 5-7 slices. The content of various nutrients in the plant is also high, and the quality of leek is good. The output is in an optimal state. Early harvesting, plant height and nutrient accumulation are still insufficient, yield is low, and the flavor is light; late harvest, plants are easy to fall down, the old leaves are easily yellowed, the risk of infection increases, and the taste of leeks tends to decline. In the case of diseases such as gray mold in the field, if the plant height has exceeded 25 cm, comprehensive consideration of various factors can lead to early harvest, which is conducive to the prevention and control of diseases and the relative stability of the overall yield.
When harvesting, sharp and clean trowels should be used. It should be done in the morning or in the evening on sunny days. It is best to harvest in the morning in the shed. In the early morning, the leek is rich in water, erect and straight, and the leek is fresh and crisp after harvesting. The flavor is rich, the storage and transportation time is short, and the yield and quality are relatively good, which is conducive to sales. It is not appropriate to harvest leeks at low temperatures and in low temperatures, because the weather in the sheds is usually high-humidity and low-temperature. The leeks grow slowly and grow weaker, and the wounds produced after harvest are susceptible to diseases.
Keeping a high degree of stay should be moderate
The height of stubble is the distance between the harvesting position and the top of the leek bulb (head of gourd). The height of stay should be moderate, neither too high nor too low, 3-4 cm is ideal. Judging from the color of the knife edge, it is appropriate to have a light yellow section. If the color is green, it means the stay is too high. If it is white, it means that the stay is too low. If the leeks remain too high, the yield and quality of the leeks will be affected. If the pods are too low, they may damage the tissues of the sclerophyllous base. This will delay the harvest time, affect the production of diarrhea, and reduce the total output of the whole year. It will lead to premature aging of the plant and its disease resistance will decline.
The number of harvests should be appropriate
The harvesting frequency of greenhouse leek should be based on plant growth, field water and fertilizer, pest occurrence, and market demand. It is best to harvest 3 times in winter and spring, and it should not exceed 4 times at most, which is beneficial to enhance plant resistance. In mid-April, the Beijing area should stop harvesting, and cultivate roots and promote growth to lay the foundation for high yields in the coming winter.
Appropriate management before and after harvest
Within one week prior to the harvest of greenhouse leek, watering and fertilization should be avoided, and ventilation and dehumidification should be strengthened. After harvesting, the greenhouse should be reinforced with insulation. Before the new leaves grow to 4-5 cm, they should not be watered and fertilized. These measures are very beneficial to avoid the occurrence of leek gray mold, is conducive to the healthy growth of leek, and promote stable production and high yield.
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