我省地处高纬度寒冷地区,无霜期短,热资源不足,全年降水少,常因低温、干旱和早霜而影响玉米产量。为探讨冬寒环境下玉米高产稳产的新途径,我们近几年来开展了玉米地膜覆盖高产栽培技术的研究、试验和大面积推广应用,均获得了早熟、抗灾、质优平几增产增收的最佳效果。一、玉米覆膜栽培增产增收效益四年试验结果,玉米覆膜栽培,每公顷增产稂食2679—4661公斤,增产幅度为29.1—60.7%;每公顷比直播玉米增加纯收入多341—773元。今后随着生产技术的不断改革和粮食产量的进一步提高,经济效益还会增加。二、玉米覆膜栽培增产原因玉米覆膜栽培增产的原因,主要在于增温、保水、促进土壤养分转化,提高供肥能力;抑制杂草生长,减轻病虫为害;改善了土壤物理性质,为玉米生长发育创造了较好的生态条件,能充分发挥中晚熟品 The province is located in the cold regions of high latitudes, frost-free period is short, lack of heat resources, less precipitation throughout the year, often due to low temperature, drought and early frost and affect corn production. In order to explore a new way of high and stable yield of maize in winter, we have carried out the research, experiment and popularization and application of high yielding maize mulch cultivation techniques in recent years. Good effect. First, the corn plastic film cultivation yield increase income four years test results, corn film cultivation, per hectare yield jan eating 2679-4661 kilograms, the rate of increase of 29.1-60.7%; per hectare increased than the direct broadcast of corn net income of 341-773 yuan more . In the future, with the constant reform of production technology and the further improvement of grain output, economic benefits will also increase. Second, the reasons for plastic film mulching cultivation Maize plastic film mulching cultivation reasons, mainly in the warming, water conservation, and promote soil nutrient conversion, improve the ability to supply fertilizer; inhibit weed growth, reduce pests and diseases; improve the physical properties of soil, as Corn growth and development to create a better ecological conditions, can give full play in the late-maturing