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本试验是在气、地温较低；电加温线上覆不同厚度的营养上；床面处于同一水平，床下不设隔热层；日通电时间大于８小时的情况下进行的。床上５厘米气温的增温值与覆土厚度呈负相关，覆土薄的气温较高有利于幼苗生长，地温增温值与覆土厚度呈抛物线关系，１—５厘米土层的含水量减少值随覆土厚度的增加而减少，覆土薄的上层土壤易干燥，有利于根系向土层深处生长。蔬菜种子出土和幼苗生长的趋势是覆土薄的好于厚的。从热效应和幼苗质量及生产实际情况综合考虑，以做好播种床再铺线，接着浇水播种，最后覆土，使电加温线和种子处于同一水平面为宜。
This test is in the gas, the ground temperature is low; electric heating line covered with different thickness of nutrition; bed at the same level, the bed does not have insulation layer; daily power time is greater than 8 hours under the circumstances. The temperature increase of 5 cm in bed was negatively correlated with the thickness of soil cover, and the higher temperature of soil thinning was conducive to the growth of seedling. The temperature increase of ground temperature showed a parabolic relationship with the thickness of soil cover. Thickness increases and decreases, the upper soil thin soil is easy to dry, is conducive to root growth to deep soil. The tendency of the excavated and seedling growth of vegetable seeds is that the thickness of soil cover is better than thick. From the thermal effects and seedling quality and production of the actual situation into account, in order to do a good job of sowing bed re-laying, and then sowing water, and finally soil, so that the electric heating and seeds at the same level is appropriate.