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冀北承德山区,自引入地膜玉米技术后,对改变气候冷凉、无霜期短的玉米种植区的低产面貌起到了重要作用。1990年承德地区推广地膜玉米30.02万亩,平均亩产达701公斤,比对照亩增243.3公斤。其中吨粮田面积1098.6亩,平均亩产达到1034公斤,最高达到1061.8公斤。1991年地膜玉米推广面积达到46.64万亩,在前期遇涝、后期干旱的情况下,充分显示了地膜玉米的抗灾能力,平均亩产仍达到624.8公斤,比对照亩增产251.5公斤。其中吨粮田面积2668.5亩,平均亩产1018公斤,最高亩产达到1123.9公斤。经两年在平泉、隆化、围场等县百亩连片吨粮示范,都获得成功,现介绍如下:
Chengde Mountain in Hebei Province, since the introduction of maize technology, has played an important role in reducing the low-yielding appearance of corn planting areas with cold and frost-free climates. In 1990, a total of 301,200 mu of plastic corn was popularized in Chengde, with an average yield of 701 kilograms per mu, which was 243.3 kilograms more than that of the control. Among them, the area of tons of grain is 1098.6 mu, the average yield per mu is 1034 kg and the highest is 1061.8 kg. In 1991, the popularization area of mulching corn reached 466,400 mu. In the early floods and late droughts, the mulching maize showed its resilience to disaster. The average mu yield still reached 624.8 kilograms, an increase of 251.5 kilograms over the control mu. Of which 2668.5 acres of tons of grain area, the average yield of 1018 kilograms, the highest yield of 1123.9 kilograms. After two years in Pingquan, Longhua, paddock and other counties contiguous tons of grain demonstration, have been successful, are presented below: