Effect of Water Stress on Yield of Some Genotypes of Bread Wheat


Field experiment was carried out during the two seasons of 2010 and 2011 at Plant Breading Centre Al-Twaitha experimental station 30 km southern east of Baghdad to study the effect of different irrigation levels on yield and its components of some genotypes of wheat. Results revealed that grain yield significantly reduced by 9% and 24% in the second and third treatments respectively when the water irrigation reduced significantly in comparison with the first treatment in the 1st season and by 8 and 33 % respectively in 2nd season. Genotype 708 out yielded the highest mean grain yield for the second and third treatments by 3.412, 2.960 tan /ha in the first season. While the genotype 603 gave the highest mean grain yield by 3.605, 2.828 tan /ha under the second and third irrigation treatments in the 2nd season too The local cultivar gave the lowest mean grain yield under all irrigation treatments. The present study revealed that the possibility of these planted developing genotypes for drought tolerant in the regions which had limited water resources.