覆膜栽培技术又叫地膜覆盖栽培技术,它在干旱半干旱地区农业生产上的推广运用,在于不仅能直接防止地面蒸发所致的水分损失,有效地利用土壤水资源。而且能使土壤中的水、肥、气、热等因子相互协调,较好地解决作物生长发育与环境条件的某些矛盾,为作物生长创造一个良好的生态环境,特别对于早春低温,有效积温少或高寒的干旱半干旱地区,能在一定程度上弥补水热资源的不足,更具有特殊意义。覆膜栽培技术的应用,其增产幅度 Film-mulching cultivation, also known as mulching cultivation techniques, is widely used in agricultural production in arid and semi-arid regions because it not only directly prevents water loss due to ground evaporation but also makes effective use of soil water resources. But also make the soil water, fertilizer, gas, heat and other factors coordinated with each other to better solve some of the contradictions between crop growth and development and environmental conditions for crop growth to create a good ecological environment, especially for early spring low temperature, effective accumulated temperature Arid and semi-arid cold or cold areas, to a certain extent, to make up for the lack of water and heat resources, but also of special significance. Application of film cultivation techniques, the increase rate