1.供试材料由北京农学院玉米研究室提供的以下试验材料:2.试验设计试验采用随机区组排列,3次重复,每重复66行,田间每排70行。每排之间设间隔0.5米,每两排之间设走道1米,两边保护行2行。小区设2行区,面积6米2,行长:5米,株行距0.33×0.6米。种植密度3800株/667米2。3.调查项目主 1. Materials for the test The following test materials were provided by the Beijing Agricultural College Corn Research Lab: 2. Experimental Design The experiments were arranged in random blocks with three repetitions of 66 lines in each field and 70 lines in each field. The interval between each row is 0.5 meters, with a walkway of 1 meter between every two rows and two rows of protection lines on both sides. Area set 2 line area, an area of ​​6 m 2, president: 5 m, spacing 0.33 × 0.6 meters. Planting density of 3800 plants / 667 meters 2.3. Survey of the main project