“大双覆”种植方式,系指将常规66～70厘米的宽垄,三垄变二垄,垄上种二行玉米。大行距99～105厘米,小行距30～40厘米,株距25～30厘米。这种新的种植方式,改善冠层结构,扩大绿色面积,提高光能利用率,扩大群体种植密度,增加干物质生产,改善通风透光条件,充分发挥边际增产效应,是玉米覆膜栽培的技术改革,是实现高产、高效优质 “Large double-covered” planting means that the conventional 66 to 70 cm wide ridge, three ridge two ridge, Ridge two rows of corn. Big row spacing 99 ~ 105 cm, small row spacing 30 ~ 40 cm, spacing 25 ~ 30 cm. This new cultivation method improves the canopy structure, enlarges the green area, increases the light energy utilization rate, expands the group planting density, increases the dry matter production, improves the ventilation and light conditions, and gives full play to the marginal increase yield effect. Technological reform is to achieve high yield, high efficiency and high quality