Abstract:

factorial experiment was carried out according to the Randomized Complete Block Design (R.C.B.D) in the field and with three replicates during the agriculture season 2020/2021, at the Agricultural Research Station of the College of Agriculture, University of Basrah, in sandy clay soils, to study the effect of three levels of ground fertilization with humic acid in three concentrations (0, 1 and 2) ml. L-1, and spraying with seaweed extract (Acadian) in three concentrations (0, 1 and 2) ml. L-1, on the growth indicators of peppermint plant. The results showed a significant superiority of the treatment with humic acid at a concentration of 2 ml L-1 on the plant height (21.78 cm), leaves number (65.5 leaves. plant-1), branches number (14.03 branches. plant-1), chlorophyll content (10.09 mg.100g), the fresh weight (1.724 mg. g), dry weight (1.936 %) and potassium (1.246%). As for the extract of seaweed (Acadian), the concentration of 2 ml L-1 showed a significant superiority on the plant height (23.00 cm), leaves number (67.000 leaves. plant-1), branches number (17.66 branches. plant-1), chlorophyll content (10.11mg. 100g), the fresh (1.495 mg. g), dry weight (1.893 %) and potassium (1.231%). As for the interaction between humic acid and the extract of seaweed (Acadian), the combination (2 ml. L-1 humic acid × 2 ml. L-1 seaweed) showed significant superiority in all the traits under study.

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