一、试验目的我省是高粱种植地区的北限,气候冷凉,无霜期短。高粱虽是高产作物,但因其喜温,往往遇到气温低,秋霜早的年份不能及时成熟造成减产。这是我省高粱生产上存在的主要问题,必须解决。为了使高粱免除冷害的威胁,在低温早霜的年份仍能获得稳产高产。利用早熟矮秆密植栽培法既能获得高产稳产,又能便于实现机械化作业。在国外,如美国早已采用早 First, the purpose of the test Our province is the northern limit of sorghum planting areas, cold climate, frost-free period is short. Although sorghum is a high-yield crop, but because of its temperature, often encounter low temperatures, early autumn frost can not mature in time to reduce production. This is the main problem in sorghum production in our province and must be solved. In order to make the sorghum free from the threat of cold damage, it is still possible to achieve stable and high yield in the early frost of the low temperature. The use of early maturing dwarf dense planting cultivation method can not only achieve high and stable yield, but also facilitate the mechanization of operations. Abroad, such as the United States has already adopted early