据国家粮油信息中心发布,我国玉米2014年平均产量5 826kg/hm~2,而美国2011年全国平均产量9 654kg/hm~2。夏玉米产粮大省山东2014年平均产量6 525kg/hm~2,河南2014年平均产量4 845kg/hm~2。黄淮海夏玉米产量不高的主要原因有两个方面:田间管理粗放和干旱。田间管理粗放主要表现在:播种质量差密度不够、施肥量不足或施肥方法不对、病虫害防治重视不够、除 According to the State Grain and Oils Information Center, China’s corn production in 2014 averaged 5826kg / hm ~ 2, while the United States in 2011 the national average yield of 9654kg / hm ~ 2. The average output of summer maize, a major grain-producing province in Shandong, was 6 525kg / hm 2 in 2014 and that of Henan in 2014 was 4 845kg / hm 2. Huanghuaihai summer maize production is not high for two main reasons: extensive field management and drought. Extensive field management is mainly manifested in: planting density is not enough density, insufficient amount of fertilizer or fertilization method wrong, pest and disease control attention is not enough, except