Effect of Spraying with Extract of Water Hyacinth and Silverleaf on Dry Weight of Weeds and Specific Characteristics of Sunflower (Helianthus annuus L.)

A field experiment was carried out in one of the special fields Al-Jazirah - Al-Budhiyab located at latitude 38.28° north and longitude 43.19° east, to find out the effect of different concentrations of the extract of the Water hyacinth and silverleaf plants in three varieties of sun flower. The experiment was applied using a split-plate arrangement within an RCBD design with three replications. The main plots were represented by the varieties Ishaqi, Sakha, and Iqmar, and the sub plots included the spray concentrations (0, 5, 15 and 25 mg L -1 ). The results showed that there were no significant differences between the cultivars in both the spring and fall seasons. As for the extracts, Water hyacinth gave the highest average dry weight of the weeds (0.076 and 0.028 g m 2 ) in both seasons, respectively. The silverleaf herb extract reduced the dry weight of the weeds (0.057 and 0.020 g m 2 ) in both seasons, respectively. While silverleaf in the fall season gave the highest average percentage of oil and carbohydrates (3.85 and 67.48%) for the two grades, respectively. Also, the concentrations 5 and 15 mg L -1 were increased from the dry weight of the weeds (0.078 g m 2 ) of the two concentrations, respectively. Whereas, the concentration increased by 25 mg L -1 from the dry weight of the weeds (0.033 g m 2 ) in the fall season. Whereas, the concentration reduced 0 mg L -1 of the dry weight of the weeds (0.035 and 0.015 g m 2 ) in both seasons respectively. We conclude that there is fluctuation in the effect of the extracts on the behavior of the varieties and their manifestation of the results due to the overlap of study factors and in different directions, so it is recommended to single out the factors in their influence on the varieties to know more accurately the behavior of those varieties.