Genetic Variability, Heritability and Correlation Studied for Yield and Yield Components in Maize Hybrids
Genetic Variability, Heritability and Correlation Studied for Yield and Yield Components in Maize Hybrids
Mohammed Ali Hussain, Zakiya Ahmed Hassan
ABSTRACT
The study was conducted in two locations, Faculty of Agriculture and Forestry, University of Duhok, Kurdistan Region-Iraq and second at FishKhabor, during spring season 2012. The experimental materials comprise seven F1 hybrids (sangaria, IK8 x zp-707, DK x Hs, zp-707 x un 44052, IK 8 x un44052, un 44052 x DK and polina). The experiment was laid out in randomized complete block design with three replications. The analysis of variance showed highly significant differences among maize hybrids for all the traits. The hybrid un44052 x DK took minimum days to tasseling (65.83 days) and silking (68.50 days). Hybrid zp-707 x un 44052 was short statured (155.59 cm) with desirable ear height of 62.93 cm. However, maximum leaf area produced by hybrid DK x Hs in both locations with averages 768.56, 670.26 and 719.42 cm2, respectively, while hybrid sangaria recorded maximum value for 300 grains weight 68.16 g and the hybrid IK 8 x zp-707 showed highest rows ear- 1 at both locations and their averages reached 19.33, 17.33 and 18.33, and the same hybrid produced highest yield plant-1 at both location with average values of 146.94, 125.84 and 136.00 g, respectively. The value for genotypic variation ranged from 4.51 (rows ear-1) to 3161.30 (leaf area) while the phe- notypic variance ranged from 5.27 to 3473.97 for the same trait. High estimates for the broad sense heritability were found in various plant traits under study. The yield exhibited positive and significant relationship with grains row-1 (0.851) and row ear-1 (0.510). The grains row-1 had positive direct effect on grain yield plant-1 and high positive indirect effect through some traits, so that these traits could be used as an index in the selection of high grain yield plant-1.
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