Analysis of Combining Ability and Genetic Parameters of Main Agronomic Characters in Maize Improved Inbred Lines

In this study ,the crossing pattern system followed a North caralina design Ⅱ (NCⅡ) The objectives of the study were to determine the combining ability and heterosis among five inbred lines with four elite inbred lines,and identify counterpart heterotic lines for the recurrent selection programs The analysis showed that 388_2 expressed the highly positive general combining ability and 7922×388_2,吉853×388_2,Mo17×389_1,Mo17×387_1 were the best combinations for yield traits It appeared that narrow genetic ability of ear length ,row number and barren ear tip was high,while that of 100_grain weight ,grain yield per plant and ear weight was low