Abstract:

In order to screen high-yield maize varieties suitable for planting and mechanical harvesting in northern Henan Province, the planting performance of 23 maize varieties (lines) suitable for mechanical harvesting in northern Henan Province were analyzed. A total of 17 indexes of agronomic traits, yield traits and mechanical harvest related traits were systematically determined, and comprehensive evaluation was carried out by principal component analysis, membership function analysis and two-way average mapping method. Four principal component factors were extracted from 9 character indexes, and the cumulative contribution rate was 85.04%, covering most information of each character index. 8 maize varieties (lines) suitable for mechanical harvest were screened out by comprehensive judgment combined with membership function analysis method, and 7 maize varieties (lines) suitable for mechanical harvest were screened out by bidirectional average plotting method using 3 key indexes of grain water content, theoretical yield and growth period. Based on all the analysis results, it was finally selected that the five varieties (lines) of ‘Ludan 6228’, ‘Xundan 816’, ‘Ludan 651’, ‘Q3761’, and ‘Jingnongke 728’ were the most suitable varieties (lines) for mechanized harvesting in northern Henan. ‘Baiyu 5272’, ‘Xundan 806’, ‘Zhengdan 112’ are more suitable for mechanized harvesting. ‘Zhengdan 958’ is not suitable for mechanized harvesting due to its high grain moisture content and growth period at harvest. This study initially formed the adaptability evaluation standard of mechanized corn varieties, and also provided theoretical basis for the screening and breeding of high-yield corn varieties suitable for mechanical grain harvest.

Key words: maize, suitable for mechanical harvest, adaptability, principal component analysis, membership function analysis, variety (line) screening