The key to the Spring Festival market is the control of greenhouse temperature. Generally after the outer leaves full withered after the shed cover film. Before cutting the shed, cut the leeks, clean up the mash, and apply water and fertilizer. After drying for 3-4 days, the wind-free sunny shed was selected. The optimum temperature for the growth of leeks is 18°C-20°C. During the daytime, the temperature in the shed is maintained at about 20°C. At night, the temperature is kept above 8°C. The temperature at the beginning of the shed is high, and it can be cooled and ventilated around noon. 4~5 days before harvesting the head knife, remove the film properly, release air after harvesting, wait until the new leaf grows to 9-12 centimeters high. When the temperature of the greenhouse exceeds 25 degrees Celsius, release the air. After each watering, the ventilation should be properly cooled. . The greenhouse leeks are not harvested after sowing until they are caught in the sheds. After about 40 days, the first crop is harvested when the leeks grow at a height of about 25 centimeters. After the interval of 20-25 knives per knife, they are not watered before the knives are cut. When the length of the knife is 6 centimeters long, combined with watering, 20-30 kilograms of compound fertilizer per hectare or 1,500 kilograms of manure and livestock manure, and then 4 to 5 days before harvest, the water quantity will be determined by the greenhouse temperature. After each cut, the ridges should be ridged, and the bulbs should be aired. After the new leaves are grown, they can be top-dressed and watered. General shed harvesting 3-4 knives, from the end of March to the beginning of April the following year, after the demolition shed, organic fertilizer, mainly to raise the roots, generally do not harvest, grow a good plot can be harvested 1 to 2 knife barley . In the rainy season, pay attention to drainage, and in the end of the summer, you can receive one season. After the autumn, strengthen the management of fertilizer and water to lay the foundation for the next greenhouse cultivation.
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