摘要： 对4种类型12个玉米杂交种的丰产性和适应区域进行的研究结果表明：不同类型杂交种产量和适应区域不同；同一类型杂交种的产量和适应区域也有差异。改良单交种豫玉5号和豫玉3号，比原单交种显著增产，且适应性较广；三交、双交种的产量不及单交种，但郑三3号、郑双3号的产量则等于或高于优良单交种丹玉13号。竖叶型单交种比平叶型单交种极显著增产。

关键词: 玉米, 改良单交种, 丰产性, 适应区

Abstract: The results of the study on yielding ability and adaptability of 4 types of 12 com hybrids indicated that the yield and the adaptive areas of different types of hybrids were different,and so were the same types. Compared with the original single crosses H. yu-5 and H. yu-3,the modified single crosses H. yu-5 and H. yu-3 could yield much higher,and also,their adaptive areas were wider. The yield of three-way cross and double cross was not as high as that of single cross,but the yield of Zheng 3-3 and Zheng double-3 was equal to that of the famous single cross Danyu-13 or higher than it. Compared with the general plant type of single cross,the arrect type of single cross could highly yield.

Key words: Maize, Modified single cross, Hybrid, Yielding ability, Adaptive area