Effects of drought stress on yield and yield components of four durum wheat genotypes

This study was done to investigating the effects of drought stress on yield and yield components and determining the best irrigation time of four durum wheat genotypes at agricultural research station of Hadji Abad in Hormozgan province during 2004-2005 cropping season. The experiments were arrange in Split Plot design and were compared in a CRBD with four replications. Drought stress as the main plot. (non- stress(S1), post-anthesis drought stress (S2), post-grain parmation drought stress (S3),) and durum wheat genotype as the subplot (Yavarous (V4), WD791982 (V3), WD791582 (V2), WD792282 (V1) were considered in the design. Stop irrigation at heading stage was initiated when 80% of the spikes were appeared. Results showed that the attenuate irrigation effects on yield and its components was significant at 1% level on the 1000 kernel weight of wheat and harvest index the effect was significant at 5%.The attenuate irrigation in heading stage reduced grain yield much more than the others. The interaction effect between drought stress and genotypes was significant at 1% level. The highest grain yield was 5676 kg/ha for WD791982 genotype at non-stress and the lowest grain yield was 2985kg/ha for same genotype at post-anthesis drought stress. It confirmed the sensitivity of that genotype to stop irrigation.