Response of Wheat Cultivars to Seed Rates Using Morphological and Yield Characteristics
The seed rates are a significant factor influencing the vegetative, reproductive, and yield traits of wheat (Triticum aestivum L). Therefore, the response of varieties to different seed rates is constantly studied to find a suitable combination among them. The experiment was performed with three replications using a split-plot design within a randomized complete block design (RCBD). Three seed rates were placed in the main plots (150, 200, 250 kg h-1), and seven wheat cultivars were placed in the sub-main plots (Sham 6, Tammuz2, Latifia, Sally, IPA 99, Rabiaa, and Abu Gharib). The results indicated that the IPA 99 during the average of the three seed rates was given the highest area of a flag leaf (44.25 cm2), grain per spike (78.85), spike per unit area m2 (441.81), and the grain yield (5.9) ton h-1. While the Sham6 gave the highest spike length (11.11 cm) and the weight of 1000 grains (35.20 g). The first seed rate (150 kg h-1) during the average of the seven cultivars was surpassed other seed rates for all traits except the plant height. IPA 99 and first seed rates combination was given the highest grain yield with (6.7) tons/hectare. Hence, it would suggest planting IPA 99 with first seed rates (150) kg h-1 in the location of this experiment. More tests can, however, be carried out at various locations in Iraq and with a wide variety of seed rates, to achieve the required combination for growing wheat and achieving high productivity with the cultivated cultivars.