Heterosis and combining ability of CIMMYT's subtropical and temperate early-maturity maize germplasm

Knowledge about the combining ability and heterotic patterns among CIMMYT's maize (Zea may L.) germplasm is essential for hybrid development work at CIMMYT, as well as at other national research programs using CIMMYT germplasm. This study was conducted to determine the heterosis and combining ability among CIMMYT's subtropical and temperate early-maturity maize germplasm. A seven-parent diallel involving two populations and five gene pools was made. The parent and 21 crosses were evaluated in 17 temperate and 5 subtropical environments during 1985-1986 (.)