In winter, because leek can grow continuously in the greenhouse, vegetable growers generally adopt more ways to increase the harvest rate to obtain more output. However, this approach tends to weaken the growth of leek, reduce quality, and even lead to increased disease. Reasonable harvesting of leeks can improve the nutritional status of leeks and roots, promote the stable and healthy growth of leeks, and ensure 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 is 5-7. The content of various nutrients in the plant is also high, quality and yield. Are in the best condition. Harvesting is too early, the overall height and accumulation of nutrients is not sufficient, the yield is low, and the flavor is light; the harvest is too late, the plants are easy to fall down, the old leaves are easily yellowed, the risk of infection increases, and the taste tends to decrease. 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. Low temperature and low temperature should not be harvested, because the weather in the shed is often high humidity and low temperature, the production of leeks is slow, growth is weak, and 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 upper end of leek bulb (height head), and the height is preferably 3-4 cm. 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 number of harvests should be based on plant growth, field water and fertilizer, occurrence of pests and diseases, and market demand. It is best to harvest 3 times in the winter and spring, and it should not exceed 4 times. 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 after cutting 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. Fertilizer Pellet Making Machine,Fertilizer Pellet Making Mill,Biomass Pellet Mill,Fertilizer Pellet Mill Machine Shandong Longze Mechanical Equipment Co.,Ltd , https://www.pelletmachinefactory.com
Rational cut of greenhouse leek to ensure quality and promote high yield