Abstract
A field experiment was conducted during the spring agricultural season of 2021 in two locations, the first in Al-Tilga (10 km northwest of Mosul) and the second in Al-Shuhada (35 km west of Mosul). The experiment was applied according to a randomized complete block design (R.C.B.D.) with a split-plot system. The levels of bio-fertilizer occupied the main plots, and the levels of humic acid and seaweed extract (Alggren-Twin) were secondary plots in three replications. The two factors of the study were as follows: The first factor was biofertilizer (Bactofed) at two levels of zero and 750 ml / 1000 L of water/ha. The second factor is four levels of two levels of seaweed extract with the trade name (Algaren Twin): 3 and 6 ml /L of water. The third and fourth levels are 8 and 16 kg/ha of humic acid. The results of the study were as follows: The addition of bio-fertilizer caused a significant increase in plant height, the yield of fresh and dry forage, the number of dahlias per plant, the weight of panicles grains, and grain yield of individual and total plants in both locations. Also, the addition of seaweed extract and humic acid increased in most of the studied traits to achieve the highest average for most traits and in both locations at the level of humic acid 16 kg/ha. Keywords: Boi-fertilizer; Humic acid; Sea Algae; Sudn agrass; Sorghum sudanense L.
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