كليدواژه :
گندم , Salinity of subsurface water , Water table , Wheat , اجزاء عملكرد , Yield component , شوري آب زيزميني , Yield , كشاورزي , سطوح ايستابي
چكيده لاتين :
The experimental design was split-split plot, with three wheat cultivars (Atrak, Tajan, and Rasool) in the main plot, three salinity levels of the subsurface water in the first sub-plot, and three depths of water table in the sub- subplots. The experiment was replicated four times.The results show that high subsurface water salinity and water tables have decreased the number of tillers, kernals per spike, fertile spikelets, plant height, 1000-seed weight (TSW), biological yield, and wheat grain yield. However, the harvest index increased significantly by high water table and salinity.Also, the effect of wheat cultivar on the components was statistically significant. Among the measured components, the biological yield, followed by the number of tillers, had the highest correlation with the grain yield. The TSW had the lowest correlation with the grian yield. Also a path analysis has shown that bilogical yield had the highest direct positive effect on wheat grain yield, through its impact on the number of tillers. The least grain yield was obtained in high levels of salinity and water table. Our results showed that with water table depths of 30, 60, and 90 cm, Tajan had a pronounced priority over the other two cultivars at all salinity levels.Also investigation of the relationship between yield and yield cmponents in the form of a multiple regression equation showed that two compponents, namely, biological yield and hervest index, accounted most of the variations of wheat grain yield.
