Improving Chemical Properties of Fig Seedlings (cv. Aswad Diyala) Using Reed Biochar and Tryptophan

The research was carried out in the lath house belonging to the Department of Horticulture and Landscape Gardening at the College of Agriculture - Anbar University for the period from March 15, 2024, to November 15, 2024, to study the effect of adding Reed biochar three levels: 0, 2, 4%, which It is symbolized by the symbols B0, B1, and B2, respectively, and sprayed with the amino acid "Tryoptophan" at four concentrations: 0 50, 100, and 150 mg L-1, which are symbolized as T0, T1, T2, and T3, respectively, in some chemical characteristics of fig seedlings cv. Aswad Diyala. 108 seedlings were selected that were as homogeneous as possible in vegetative growth. A two-factor 3 x 4 factorial experiment was implemented according to a completely randomized block design. The experiment contained 12 treatments, three replicates, and four seedlings per experimental unit. The effect of adding Reed biochar was significant on all the studied traits except for the percentage of calcium, especially the high level B2, which achieved the best values for the traits total chlorophyll 1.41 mg g-1 fresh weight, total carbohydrates 15.54%, nitrogen 1.86%, phosphorus 0.32%, potassium 0.64%, magnesium 0.47%, iron 169.37 mg kg-1, zinc 44.94 mg kg-1, and manganese 65.91 mg kg-1. Spraying with tryoptophan showed an effect that reached the level of significance on all traits, treatment T3 achieved the best significant effect on the traits total chlorophyll, total carbohydrates, nitrogen, phosphorus, potassium, magnesium, calcium, iron, zinc, manganese, which amounted to 1.48 mg g-1 fresh weight, 15.32%, 1.83%, 0.34%, 0.61%, 0.48%, 1.30%, 171.01 mg kg-1, 43.37 mg kg-1 and 65.35 mg kg-1. The interaction of the two study factors reached the level of significance in affecting all the studied traits except for the chlorophyll content of the leaves. The interaction treatment (B2T3) was distinguished in achieving the best values depending on the type of the studied trait, where the lowest values were in the control treatment (B0T0) for all the studied traits.