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Two main questions in programs introgressing exotic maize germplasm into  temperate materials are the choice of available exotic sources to work with,  and the proportion of exotic germplasm that should be incorporated into  adapted germplasm. The objective of this study was to compare effects of  different proportions of tropical maize inbred line NC298 in hybrids male  parent on grain yield and grain moisture content, using method of orthogonal  polynomials. Methods of direct crosses and backcrosses were used to form four  hybrid groups (six hybrids each) containing 0, 25, 50 and 75 percent of  tropical exotic germplasm, respectively, by their male parent (or one half of  mentioned proportions in the corresponding hybrids). The linear components of  the germplasm proportions sum of squares, were significant (p<0.01) for both  grain yield and moisture content and the cubic effect (p<0.05) for grain  yield only. Results in this study clearly suggested backcross foundation  populations with an adapted line to be appropriate selection sources for both  grain yield and grain moisture content

Effect of different proportions of exotic germplasm on grain yield and grain moisture in maize