THE EFFECT OF ADDING HUMIC ACID AND FOLIAR APPLICATION WITH GIBBERELLIN (GA3) ON THE GROWTH AND YIELD OF BREAD WHEAT TRITICUM AESTIVUM L
Keywords:
bread wheat, humic acid, gibberellin acid.Abstract
A field experiment was conducted in one of the agricultural fields in Taza district - Kirkuk Governorate for the 2022/2023 agricultural season in a randomized complete block design (RCBD) with three replicates to determine the effect of ground addition of humic acid and foliar spraying with gibberellin on the growth and yield of bread wheat. The research results showed that the concentration exceeded 100 mg. L-1 of gibberellin acid in terms of the number of shoots, plant height, weight of 1000 seeds, and grain yield. The values were: 258.05 shoots. m2, 99.07 cm, 44.39 g, and 5.97 tons.ha-1 , respectively. The concentration also exceeded 100 mg. L-1 of gibberellic acid in weight of 1000 grains, protein percentage, and physiological maturity values were: 43.88 g, 14.02%, and 37.53 days, respectively. The level exceeds 8 kg. Ha1of humic acid in the characteristics of plant height and protein percentage. The values were: 98.99 cm and 13.43%, respectively. It also exceeded the level of 16 kg. E-1 of humic acid in the characteristics of number of branches, physiological maturity, weight of 1000 grains, grain yield, and percentage of protein. The values were: 268.06 trees. m2, 37.41 days, 844.2 g, 6.25 tons. Ha-1and 13.60%, respectively. The combination (200 mg.L-1 ) of gibberellin and (16 kg.L-1 ) of Humic excelled in giving it the highest averages for the number of strands, 277.46 strands. m2 , and the grain yield was 6.52 tons.ha-1, and the protein percentage was 14.54%. The combination (100 mg.l-1 ) and gibberellin (8 kg.ha-1 ) Humic outperformed by giving the highest average plant height of 100.37 cm, and the grain yield was 6.54 tons.ha-1 . The combination (100 mg.L-1 ) of Gibberellin (16 kg.L-1 ) of Humic was superior in terms of weight of 1000 tablets, 45.82 grams
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