2014～2016年在北京密云区和延庆区开展4个点次7组机械粒收试验。结果表明，破碎率均值为8.81%，高于《玉米收获机械技术条件（GB/T 21962-2008）》中规定子粒破碎率应≤5%的标准；杂质率均值为1.25%，总损失率为1.10%，分别低于≤3%和≤5%的国标标准。延迟10 d收获，供试6个品种玉米子粒含水率均值由25.9%降低到20.9%，下降了5个百分点，玉米收获质量得到显著改善，其中破碎率由5.71%下降到3.68%，降低了2.03个百分点。按双向平均作图法筛选出宁玉524，MC703，真金8号，登海9号和联创808等5个适宜机械粒收候选品种，其子粒含水率平均为23.27%，较对照郑单958低4.71个百分点；平均单产1 4921.7 kg/hm²，较郑单958对照高出14.87%。

4 points and 7 groups of mechanical grain harvest experiments were carried out in Miyun and Yanqing of Beijing from 2014 to 2016. The results showed that, the mean of broken rate was 8.81% higher than the standard of less than 5% in the technical requirements for maize mechanical harvester(GB/T 21962-2008). The average impurity rate was 1.25%, and the total loss rate was 1.10%, which were lower than the the national standards of less than 3% and 5% respectively. As the harvest time was delayed for 10 days the average value of the grain moisture content of 6 cultivars was reduced from 25.9% to 20.9%. The harvest quality of maize was greatly improved with the broken rate decreasing from 5.71% to 3.68%. According to the two-way average mapping method, we selected 5 maize cultivars suitable for mechanical grain harvest, including Ningyu524, MC703, Zhenjin 8, Denghai9 and Lianchuang808. And the average of grain moisture content of these cultivars was 23.27%, 4.71% lower than that of Zhengdan958(27.75%), and the average yield was 14921.7 kg/ha, 14.87% higher than that of Zhengdan958.

国家重点研发计划（2016YFD0300101、2016YFD0300110）、国家玉米产业技术体系项目（CARS-02-25）、中国农业科学院农业科技创新工程