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阳高县位于外长城脚下,十年九旱,气候寒冷,无霜期仅有120天左右。历年种植玉米往往因早霜袭击不能正常成熟而影响产量,尤其在下湿滩地和丘陵地区更为突出。如果提早播种,就会因地温低,种子霉烂而造成缺苗断垄。为解决这一矛盾,县技术站从1980年开始,在城关等公社进行玉米挂蜡早播试验和大面积示范,1981年播种面积达14000多亩。实践证明,采用玉米挂蜡早播技术,增产效果十分显著。
Yanggao County is located at the foot of the Great Wall, nine drought ten years, the climate is cold, frost-free period of only 120 days. In the past years, corn planting is often affected by the early frost attack can not affect the normal maturity of production, especially in wetlands and hilly areas more prominent. If sown early, it will be due to low temperature, seed mildew and lack of seedlings caused by broken ridge. In order to solve this contradiction, the county technical station started from 1980 and conducted pilot tests and large-scale demonstration of corn hanging wax in the communes such as Chengguan. In 1981, the sown area reached 14,000 mu. Practice has proved that the use of corn hanging wax early sowing technology, the yield effect is very significant.