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我县是一个落后的山区县,海拔1420～3600米,地形复杂,土壤瘠薄,自然灾害频繁,玉米是我县主要粮食作物,面积和产量均占80%以上。玉米单产低而不稳,农业生产徘徊不前,一直是靠天吃饭。自1987年引进地膜栽培技术以来,玉米生产有了进展,单产有所提高,面积不断扩大。1988年全县共种植地膜玉米6000亩,平均每亩比露地增产125公斤以上,共增产值60万元,扣去地膜成本14万元,新增纯收入46万元,
My county is a backward mountainous county, elevation 1420 ~ 3600 meters, complex terrain, infertile soil, frequent natural disasters, corn is my county’s main food crops, both area and output account for more than 80%. Low and unstable corn yields, agricultural production stagnant, has been relying on the weather to eat. Since the introduction of plastic film cultivation technology in 1987, progress has been made in corn production, yield per unit has been increased, and the area has been expanding. In 1988 the county planted a total of 6,000 acres of plastic corn, an average yield of more than 125 kg per mu than the open field, a total increase of 600,000 yuan output value, buckle to the film cost 140,000 yuan, net income of 460,000 yuan,