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This study was done to determine the effect of the grain yield and its related characteristics on 10 openpollinated maize varieties and their 45 F1 hybrids using correlation and path coefficient analysis. A two-year study was conducted on maize genotypes at the University of Ilorin Teaching and Research Farm Ilorin, Nigeria, during 2005 and 2006 growing seasons. Positive and significant phenotypic and genotypic correlations were found for days to 50% tasselling with plant and ear heigh t, and grain yield with plant height, number of grains ear -1 and ear weight. Positive and significant environmental correlation was also recorded for grain yield with plant and ear height, and ear weight. The path analysis revealed that, days to 50% silking, ear weight and number of grains ear-1 had the highest direct effect on grain yield, while number of grains ear-1 had the highest moderate indirect negative effects on grain yield. Days to flowering, plant and ear height, number of grains ear-1 and ear weight could be the important selection criteria in improving open pollinated maize varieties and hybrids for high grain yield. Key words: Phenotypic, genotypic correlation, open pollinated varieties, yield  characters

Interrelationship and path coefficient analysis of morpho-physiological traits among maize (&lt;i&gt;Zea mays&lt;/i&gt; L.) diallelic crosses in the Southern Guinea Savanna of Nigeria