地处燕山余脉丘陵山区,海拔1040米,无霜期95—140天,有效积温1600—3100C 的赤城县,每年推广旱地地膜玉米万余亩,连续实现年平均亩产690余公斤的好收成,比同品种露地玉米增产57%左右,亩增收入76.20元。他们连年高产的主要经验有五条:一、因地选择对路品种他们根据本地区海拔高、无霜期长短不等、积温差异大等特点,选择生育期较长,生长潜力大,抗逆性强的丰71、黄417、中单2号,分别种植在无霜期100天、110天、120天的地 Yanshan Mountains is located in the mountains and hills, 1040 meters above sea level, frost-free period of 95-140 days, the effective accumulated temperature 1600-3100C Chicheng County, an annual promotion of more than 10,000 acres of dry film mulching corn, continuous realization of the annual average yield of 690 kilograms of good harvest than Maize with the same crop yield increase of about 57%, mu increase income 76.20 yuan. They have five major experience in successive years of high yield: First, because of their choice of varieties on the road according to their high elevation in the region, frost-free period ranging from large differences in temperature and other characteristics, choose a longer growth period, growth potential, strong resistance Feng 71, Huang 417, Zhongdan 2, were planted in the frost-free period of 100 days, 110 days, 120 days of land