Effect of Soil Extracts of Sunflower Residue In Germination and Growth of Wheat and Sunflower Cultivers

Laboratory experiments were conducted to find the allelopathic effects of aqueous extracts of sunflower residue added to soil of )local and Syrian caltivar ( in the four growth stages )seedling, elongation, flowering and maturity (at three concentrations )2.5,1.5, 0.5 %( w.w in germination and growth of wheat and sunflower cultivars. The result showed that aqueous extracts of sunflower )Syrian( caused the reduction in germination percentage, plumule and radical growth of sun flower and wheat.
The statistical analysis of the results showed a significant difference between wheat and sunflower in sensitivity to the effect of aqueous extracts of sunflower residue (Amrabee) wheat cultivar and (local) cultivar of sunflower gave best germination and growth rates.