甜莱覆盖地膜栽培技术,在内蒙古自治区经几年的大面积应用,明显表现增产,受到当地农民的欢迎。但从种植情况看,地膜甜莱普遍存在着不同程度的缺苗、死苗现象。对此,1985—1987年经对呼和浩特市郊区和土左旗等地调查看出,缺苗、死苗的原因有:①土壤过湿或过干。这往往引起整块地缺苗。如1985年善岱乡一块下湿地,种甜菜前遇雨,土壤湿度过大,仓促播种,盖膜后引起种子腐烂,缺苗率达55％。而缺苗最严重的地不少是土壤水分 Tianlai mulching cultivation techniques covered in the Inner Mongolia Autonomous Region after a few years of large-scale application, the apparent yield increase, welcomed by the local farmers. However, from the planting situation, the film mulberry popular there are varying degrees of lack of seedlings, dead seedlings phenomenon. In this regard, from 1985 to 1987 by Hohhot suburbs and Tuzuoqi survey found that the lack of seedlings, dead seedlings are: ① the soil is too wet or too dry. This often leads to the lack of whole piece of seedlings. Such as a good piece of wetland in 1985, a wetland, the case of rain before the beet, soil moisture is too large, rush to sow, cover the film caused by seed rot, lack of seedling rate of 55%. The lack of seedlings is the most serious soil moisture