| A field experiment was carried out in the field of experiments of the Department of Field Crops - College of Agriculture - University of Tikrit during the winter season 2020-2021 in gypsum soil in order to study the effect of humic acid (without addition, addition in the four-leaf stage, addition in the flowering stage) on some growth and yield characteristics and its components. For some local wheat varieties (Al-Rasheed, Tammuz/2, Ibaa 99), the most important results of the study were as follows. In terms of plant height, Al-Rasheed cultivar excelled over the rest of the cultivars, and it was noted that there were significant differences between the cultivars in this trait. There were no significant differences between the two cultivars, Al-Rasheed and Tammuz 2, in the two characteristics of the flag leaf area and the length of the spike, as the Al-Rasheed variety outperformed the rest of the cultivars in these two characteristics. Significant differences are observed between the cultivars in the characteristic of the number of Al-Sunbulah grains, as the Tammuz 2 variety excelled in this trait, and no significant differences were observed between the cultivars in the characteristic of the weight of a thousand grains, and in the yield of grains. Ibaa 99 gave the highest value to this trait. As for the second factor, which is the date of addition, the second date was superior to the branching in all characteristics except for the traits (plant height, the number of spike grains, the weight of a thousand grains) did not reach the limits of significance. All traits except for the number of the spike grains, where the Tammuz 2 variety excelled with the date when flowering, but the weight of a thousand grains did not reach the limits of significance. |
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