玉米是我国的主要粮食作物,面积为3亿亩左右。30多年来,我国玉米播种面积扩大了60%,总产由1600万吨增加到7366万吨。从玉米面积和总产来看,我国玉米生产发展较快,但是目前我国玉米单产水平仍然很低,如何进一步提高玉米单产已成为我国玉米生产的首要问题。通过全国各地的试验,普遍认为推广紧凑型玉米杂交种是提高玉米单产的重要途径。一、国内外紧凑型玉米生产概况 Corn is China’s main food crop, covering an area of ​​300 million mu. In the past 30 years, the sown area of ​​maize in our country has expanded by 60% and the total output has increased from 16 million tons to 73.66 million tons. From the corn area and total output, China’s corn production has developed rapidly, but at present, China’s corn yield is still low, how to further improve the yield of corn has become the primary issue of China’s corn production. Through trials across the country, widespread promotion of compact maize hybrids is an important way to increase yields of maize. First, domestic and international compact corn production profile