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随着工厂化育苗的发展,许多大中城市冬春都采用塑料拱棚加地热线作为快速育苗设备。由于塑料薄膜保湿性能大大超过保温性能,为提高地温和棚内气温,夜间和雨雪天上午10点前,都必须通电。升温的结果,加大了土壤蒸发,直接增加了棚内空气相对湿度。同时,使土壤含水量降低,必须增加灌溉次数。而浇水后蒸发,又反过来增加了空气湿度。棚内空气湿度过高,在膜上结露后,大大降低了透光性,使冬季光照强度本来就不足的矛盾更加突出,直接影响茄果类秧苗的生长发育。为除去结露,目前多采用竹杆套塑料袋刮水。但在刮水过程中,一部分水滴入苗床,
With the development of factory nursery, many large and medium-sized cities winter and spring are using plastic shed plus geothermal hotline as a rapid breeding equipment. As the plastic film moisture performance greatly exceeded the thermal insulation properties, in order to improve the temperature and greenhouse temperature, night and rain and snow before 10 o’clock in the morning, must be energized. As a result of the warming, the soil evaporation is increased, directly increasing the relative humidity of the air in the shed. At the same time, to reduce the soil moisture content, we must increase the number of irrigation. After watering and evaporation, which in turn increases the air humidity. After the air humidity in the shed is too high, dew condensation on the membrane greatly reduces the light transmittance, making the contradiction between the insufficient light intensity in winter and the direct impact on the growth and development of solanaceous seedlings. In order to remove the condensation, the current use of bamboo pole cover plastic bag wipe. However, in the wiping process, part of the water drops into the seedbed,