Estimation of Correlations and Path Coefficient Analysis of Bread Wheat Varieties Cultivated under Three Seeding Rates

	Estimation of Correlations and Path Coefficient Analysis of Bread Wheat Varieties Cultivated under Three Seeding Rates
Kufa Journal for Agricultural Science
Article 1, Volume 3, Issue 1, 2011, Pages 181-195
Abstract
Abstract A field experiment was conducted in a field at Rice Research Station / Al-Mishkhab / Al-Najaf region . Four bread wheat cultivars Triticum aestivum L. ( Abu-Ghraib , IPA 95 , IPA 99 , Al-Ez ) were planted during 2009 – 2010 season under three seeding rates (40 , 80 and 120 kg/ha) . A split plot arrangement in R.C.B.D. with three replicates was used . The seeding rates were put in main plots and wheat genotypes were assigned in the sub-plots . Genotypic , environmental and phenotypic correlation coefficients and path coefficient analysis were computed for the studied characteristics as follows :- spike length , number of grains/spike , number of spikes/m2 , 1000 grain weight , and grain yield . The results showed that coefficients of correlations were varied with effect of different seeding rates . The genotypic , environmental and phenotypic correlations for grain yield with number of spikes/m2 were positively and highly significant under (40 kg/ha) . Spike length was positively and highly significant correlated with grain yield under (80 kg/ha) both at genotypic and phenotypic levels . Both traits gave high and positive as genotypic-phenotypic direct and indirect effects . So , both traits could be used as selection indices to improve wheat yield . Key words : Correlation , path coefficient , seeding rates , wheat

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