There are two types of leeks in greenhouses in winter: one is common leeks, which is frozen in the ground after the leaves are frozen, and the new leaves grow after the shed, which is also called root leeks. Listed after the new year to the Spring Festival. The other type is the snow frog, which is a shed before the early frost. The zelkova leaves can grow continuously without returning to roots. When the roots of leeks cannot grow after frost, they are harvested and marketed. Until the new year ago, they fill the vacancy of the leeks in this period. The sheds have a short cycle, high yield, and good efficiency. They have developed rapidly in recent years. Snow pods have the characteristics of low temperature resistance, fast growth, no rooting, etc. The following technical measures should be taken when cultivating. First, the selection of species The main species of ferrets are Jiaxing Baigen, 791, Pingdingshan wide leaves, Xueyu Wang and so on. Through years of practice, Jiaxing Baigen has anti-low temperature, high yield, and good quality. The advantages of Ye Kuan and others are welcomed by people. Second, the sowing period and the amount of sowing. Shed planted nymphs were transplanted and seeded in two. Seedlings are good quality, high yield, and good yield. Its sowing date is when the soil is defrosted by 10 cm in the early spring, planting 100 square meters requires more than 70% germination rate of 0.3-0.4 kg. The live broadcast is in the winter and spring after the sheds are pulled and the 100 square meter sowing volume is 0.4-0.5 kilograms. Third, fertilize the soil to do the trick. The nursery field spreads 1 cubic meter of decomposed ripening fertilizer and 100 grams of urea and 2 kg of diammonium per 100 square meters before planting. After planting, it is turned to the ground, smashed, and beded to fully mix the dirt. Transplant or broadcast Honda, spread 1–3 cubic meters of urea, diammonium and potassium sulphate per 100 square meters. After planting, the ridges are made 0.6 meters wide and 0.2-0.3 meters high and are ready for transplanting or live broadcasting. High ridges are an important part of sheds to prevent the disease from seizing high yields. Fourth, transplant or live. The suitable period for transplanting or live broadcasting is after winter and spring shed vegetables are transplanted. After transplanting, each ridge can be planted with 2-3 rows, and the hole spacing is 10 cm. After the lifting, the loose leaves can be cut off. Leave 4-5 cm pseudo stems. Each seedling is planted with about 10 strains of seedlings and 12-14 strains of weak seedlings. Attention should be paid to the prevention of fertilization (especially the prohibition of chemical fertilizers) in the planting of seedlings, and the prevention of root burning. After planting watering ridges. The live broadcast is conducted on a well-made dome with holes drilled. The hole spacing is also 10 centimeters. Each hole is planted with 18-20 grains and the cover soil is 1-1.5 centimeters. Keep the soil moist after sowing, pay attention to rain drainage, remove weeds in a timely manner, or spray herbicides such as “Dilean†or “Shi Tian Park†before sowing or transplanting to eliminate weeds. Fifth, cover film insulation. Snow flies do not return to the roots at low temperatures and can grow directly after filming. Therefore, it is necessary to cover the shed film 5-10 days before the initial frost period to prevent frost, but the tarpaulin film does not have to be tightly covered, and it is lifted before the shed to facilitate ventilation. After entering the frost period, it will gradually become tighter as the temperature drops. When the temperature in the greenhouse is lower than 10°C, it is necessary to cover the straw and keep warm. After being frozen in the ground, when the minimum temperature in the shed reaches 2-3°C, a small shed of 2-3 meters in width and 0.5-1 meters in height shall be covered with a shed film in the shed. After entering the winter solstice (December 22) at night, the temperature in the small arch shed was as low as 3-5°C, and paper quilts or other insulation materials were added to the small arch shed at night. In this way, the snowball can grow normally in the cold winter without any heating equipment. Six, management and harvest. When the soil in front of the shed film is dry, one ditch can be poured, and at the same time, 50-70 grams of urea can be traced along with the water in each ditch (note that ammonium sulfate cannot be traced to prevent acidification of the leek yellow tip), and the first knife can be harvested before and after the National Day. . Note: Be sure to spray a 1000 times solution of quick lordone or moldewine to cut the wound while cutting to prevent the occurrence of gray mold. After the daytime shed temperature reaches above 24°C, it is necessary to timely ventilate and reduce temperature and humidity to prevent the occurrence of gray mold and disease. The minimum temperature at night cannot be lower than 2°C. The relative humidity in the shed should be controlled below 70%. Before and after cutting a knife, the leeches should be drenched once every 7-10 days before and after cutting, and 50-70 grams of urea should be chased with each ditch of water. A knife can be harvested every 25-35 days. You can cut 3-4 knives before the Spring Festival. Per square meter can be harvested 4-5 kg, per mu output value of 6,000 yuan. After cutting the first kimchi dish, immediately cover the mulch with the ridge. After 2-5 days, cut a 3-4 cm cross with a knife or a bamboo skewer on each leek seedling to prevent the occurrence of gray mold. It can also increase ground temperature, maintain soil moisture and reduce the humidity in the greenhouse, which is very beneficial to the growth of leeks.
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