甜菜是属于纯商品型农作物,它的生物学特性,与内蒙古高原冷凉气候带的河北省坝上旱作农业区的生态条件相适应。但多年来甜菜生产上存在着一个突出问题是:保苗率低。据1982—1984年大面积考察结果:甜菜缺苗率为44.8％,不少地块在60％以上,造成亩产不足千斤。保苗率低的原因,固然有整地质量和病虫害等问题,但最主要的还是春季播种干旱、土壤水分不足听造成的。多年来生产实践和试验表明:甜菜播后多次镇压是一项蓄水保墒,实现一播保全苗、创高产的增产措施。在旱作农业区,一般春播前后进行镇压保墒,是比较普遍的,但多为镇压一次。尤其是甜菜播深仅3—4厘米, Beet is a purely commercial crop, and its biological characteristics are compatible with the ecological conditions of dry farming areas on the dam of Hebei Province in the cool climate belt of Inner Mongolia Plateau. But over the years beet production there is a prominent problem is: low seedling rate. According to a large area survey conducted in 1982-1984, the lack of seedling rate of beet was 44.8%, and many plots exceeded 60%, resulting in less than 1000 kg of mu production. The reason for the low seedling rate is that although there are problems with soil preparation and pests and diseases, the main problem is the sowing of spring in spring and insufficient soil moisture. Over the years the production practices and tests show that: after repeated beet broadcast suppression is a water storage, to achieve a broadcast security seedlings, a high yield increase measures. In dry farming areas, the general spring sowing before and after the suppression of soil moisture, is more common, but mostly repression. Especially beets broadcast only 3-4 cm deep,