Document Type : Original Article
Author
Assistant Professor
Abstract
The drought stress significantly impacts the quantity and quality of wheat yield. To assess the tolerance of new wheat cultivars and lines to this stress, a split-plot experiment was conducted in a randomized complete block design with three replications over two years at the Chehartagh Research Station in Shahrekord. Treatments included three levels of irrigation cessation as main plots (full irrigation, irrigation cut off at flowering, and grain filling stages) and seven wheat genotypes as subplots (Mihan, Heydari, Pishgam, CD-93-9, CD-93-10, CD-91-12, and CD-92-6). Results showed that irrigation cut off significantly affected grain yield and vegetative characteristics at the 1% level. The highest grain yield of 10.26 tons per hectare was obtained under full irrigation conditions from the Mihan cultivar. The average grain yield under full irrigation, irrigation cessation at the grain filling stage, and irrigation cessation at the flowering stage was 8.74, 5.27, and 3.94 tons per hectare, respectively, indicating significant differences among treatments. Under irrigation cut of at the flowering stage, the genotype CD-93-10 exhibited the highest grain yield of 4.44 tons per hectare, significantly differing from other genotypes. Therefore, in the event of irrigation cessation or reduced water consumption during the final growth stages, this genotype demonstrated a 6 to 25% higher yield potential compared to other genotypes and is recommended for cultivation in such conditions.
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