Matters needing attention for planting lettuce in small arch shed

Small arch shed lettuce management is simple, less investment, an mu of land less than one thousand yuan, a lettuce can grow to 2-3 jin, an mu of land income can have tens of thousands of yuan. There are the following points to note: First, we must grasp the planting time. lettuce is generally in the first year around the autumnal equinox seedlings, early winter when planting. The lettuce stem grows along with the plant, continuously elongates and expands, the stem too much moisture in the early colonization, easy to occur the freezing injury. Colonization too late, early absorption of nutrients can not supply winter growth needs. Second, pay attention to the number and method of watering. lettuce planting from the first year to the second year may harvest, generally only four times watering enough. The first water is poured after planting, and the second water is mainly frozen water. After the frozen water is poured, the bed is covered with waste straw mat, which mainly plays a role in heat preservation to ensure that lettuce can survive winter smoothly. The last two watering times are from the beginning of spring to about 10 days before harvest. Third, pay attention to topdressing. 60-70 jin of high-potassium compound fertilizer is used in combination with each watering, which is beneficial to fruit swelling, and prevents the upper leaves from growing too much due to partial use of high-nitrogen compound fertilizer, forming a closed environment and improving the occurrence probability of diseases. Fourth, we should pay attention to disease prevention. The lettuce disease is very few, after setting up the arch shed should pay attention to daily ventilation, reduce the humidity in the shed, reduce the occurrence of disease. After the temperature rises, there is no need to cover the film. In daily management, chlorothalonil or amisida, Zhongshengxin, etc. can be sprayed once every 10-15 days to prevent diseases.