Journal of Kerbala for Agricultural Sciences

The experiment was carried out during the season 2016-2017 in Al-Dora/Al-Buetha village, using Randomized Complete Block Design (RCBD)with three replications by factorial experiment arrangement . The experiment included two factors, the first: varieties (Turki, Ukrani, Spanish, Syrian, Duth, and local).The second factor: plant densities (47.62, 71.34 thousands plant.hectar-1). Genotypic, phenotypic variation, heritability, co-heritability, correlation coefficient and path analysis was estimated for each density for nine traits: plant height, numbet. of branches.plant-1, no. of leaves plant-1, total dry matter, number of pods.plant-1  , pods weight, number. of seeds.pod-1 , pod length and seed yield.plant-1.The results showed high significant different for all studied traits for both densities. There was a high genetic variation for no. of leaves.plant-1, plant height and total dry matter, that reached (249.91, 129.52,  and 116.65)respectively  in the first density and (327.58, 110,292.01) for second density. The higher value of heritability broad sense appeared in plant height, number of leaves and pod length in first density, for plant height, number of leaves and total dry matter in second density. The higher value of co-heritability appeared between no. of branches.plant-1 and number. of pods.plant-1 and between number of pods.plant-1 and pod weight that reached 1.825and 1.838 in first density .Co-heritability between number of branches plant-1, no. of pods.plant-1 and no. of seeds.pod-1 that reached 1.355 and 1.149 in second density. Genotypic correlation coefficient higher than phenotypic coefficient, this indicates that gene action leads the main role in these traits that plant breeder can rely on the selection genotypes of high production from the faba bean. The higher genetic, phenotypic correlations were for number of leaves and total dry matter with seed yield in first density, and pods weight, total dry matter with seed yield in second density. The path coefficient analysis results showed that the pod weight.plant-1 and pod length had a higher direct effect in first density and for total dry matter and no. of seeds.pod-1 in second density, and thus, these traits can be used as selection criteria under the studied densities for selection of high yield

Afield experiment was conducted during two season , spring and fall 2013  in the Field of Crop Science Dept. – College of Agriculture – University of Baghdad . The objective of this experiment are to estimate the genetic parameters , broad sense heritability and co-heritability for several traits of maize ( Zea mays L.) for the synthetic cultivar , Ibaa 5012 , under watered and water stress treatments ( 5 and 10 days intervals) by using randomized complete block design with four replications . Genotypic , phenotypic and environmental variation (   , , ) genotypic and phenotypic coefficient of variation ( GCV , PCV) and broad sense heritability were estimated for ten traits : traits : days to anthesis , days to silking , plant height , ear height , number of leaves , leaf area , days to physiological maturity , dry weight , crop growth rate and grains yield . The results showed that genetic variance for most traits more than environment . GCV values for all traits very closed from PCV , that means the traits were under genetic control .All values of broad sense heritability for both seasons and irrigation treatment are high . The highest value was for the dry weight , crop growth  rate, grain yield and number of leaves in two season under irrigated , while in water stress , in addition to these traits the days to physiological maturity . It can conclude that the change in the plant environment due to water stress caused a change in the genetic parameters of the studied traits , especially the change in the amount of genetic variance and the environmental variance , it increased the values of some parameters of the traits and reduced to some others . This led to a change in the values of heritability and co-heritability.