Early spring management of leek in greenhouse

First, temperature management. Leek likes to be cold and cool, and the suitable temperature for growth is 15 mi 24 degrees, which should be kept out properly during the day. In order to promote sprouting, the daytime room temperature should be kept at 18 Mel 25 degrees after the buckle shed and at 17 Mel 23 degrees after sprouting. Before the Chinese chive is harvested, the daytime temperature is 15 ~ 22 degrees, and the night temperature is 10 ~ 12 degrees. In the future, the temperature of each cut can be increased by 2mi 3 degrees, but not more than 30 degrees. Second, fertilizer and water management. The growth of leek requires lower air humidity and higher soil moisture. The greenhouse air humidity is maintained at 60-70%, and the absolute soil water content is maintained at 13-15%. In general, heavy soil will no longer be watered if it is watered for the winter before buckling the shed. In order to promote the growth of Chinese chives, one small amount of water can be poured 7 days before the first knife harvest, and 15 kilograms of ammonium nitrate should be hydrated and applied with water every 667 square meters (mu), and then water and fertilizer should be applied 7 days before each leek harvest. Third, foliar fertilization. During the growth period, potassium dihydrogen phosphate is sprayed every 7 days with a concentration of 300 times, and gibberellin can also be used with a concentration of about 40,000 times. When it grows to 15 cm, spray 1 gram per 667 square meters, add 50 kg of water, and then add 0.5% ammonium nitrate for better effect. Fourth, harvest. The harvest period is generally in New Year's Day or before the Spring Festival, the cut with yellow is more appropriate, the interval between the two leeks is about 35 days.