蔬菜塑料大棚育苗乡在冬季和早春季节,控制好棚内温度和温度是育苗中的关键性技术措施,如棚内土壤湿度过大,则空气相对湿度大,温度不易升高,使菜苗生长缓慢,甚至沤根死苗。故一般生产上多采用通风降湿法,将大棚的两端或两边薄膜卷起通风,使棚内的水蒸汽排出。但这种方法在棚内土壤局部过湿,秧苗幼小时,则不太适合。根据我们的实践,可采用天幕除湿法,既省工效果又好,方法是:在棚内局部湿度大的苗床上方,斜挂一块面积比湿处稍大的长方形塑料薄膜,呈单屋脊形,薄膜上沿高的1.2米,下沿高约0.8米,薄膜下沿对齐苗床厢沟。当大棚内温度升高到一定程度时,土壤中的水 In winter and early spring, controlling the temperature and temperature in shed is the key technical measure in nursery. If the soil humidity in shed is too large, the relative humidity in air is large, the temperature is not easy to increase, and the growth of vegetable shoots is slow , Or even rooted dead seedlings. Therefore, the general production of more use of ventilation and dehumidification method, the two sides of the shed or both sides of the film rolled up ventilation, so that shed shed water vapor. However, this method of soil in the shed partially over-wet, young seedlings, it is not suitable. According to our practice, we can use the canopy dehumidification method, which not only saves labor but also works well. The method is as follows: a rectangular plastic film slightly larger in area than the wet area is slopingly hung above the seedbed with large local humidity, Film along the high 1.2 meters, along the next high of about 0.8 meters, the film along the edge of the submarine bed gap. When the temperature inside the greenhouse rises to a certain extent, the water in the soil