Promotion of Growth and Fruits Quality Parameters of Tomato Plant by Bio-Fertilizers (Trichoderma Harzianum and EM1) and IAA

The present study was carried out in Hamah province, Syria, during the period from (2021-2022), to study the effect of treatment with Trichoderma harzianum bio-fertilizer (at a concentrations of 105, 106, 107 spores/ml) and EM1 bio-fertilizer (at a concentrations of 5, 10, 15 ml/l) and the indole acetic acid (IAA) (at concentrations of 50 and 100 ppm) and their interactions on growth, photosynthetic pigment concentration and Fruit quality of tomato plants (Mersini variety). The chemical analysis was carried out in the laboratories of Faculty of Agriculture Engineering - Damascus University - Syria. The study contains 21 treatments and the data (Average of the two seasons) was calculated using a randomized complete block design. The results showed that treatments with IAA 50 ppm ,Trichoderma harzianum 105 spores/ml, EM1 at all concentrations and their combination treatments with IAA 50 ppm improved all studied indicators compared to control, except TA parameter which increased with treatment IAA at 100 ppm and its combination with bio-fertilizers at all concentrations. The combination treatment of Trichoderma harzianum 105 spores/ml and IAA 50 ppm resulted in the best morphological characteristics (34.17 Days for Days to first flower, 39.17 Days for Days to first flowerset, 56.22 Days for Days to 50 % flowering), photosynthetic pigment concentration (4.69 mg/g Chlorophyll A, 2.17 mg/g Chlorophyll B, 2.05 mg/g Carotene), and TSS (4.82 Brix°). While the treatment trichoderma harzianum 105 spores/ml alone resulted in the best TSS/TA (20.53) and The combination treatment of trichoderma harzianum 107 and IAA 100 ppm resulted in the best TA (0.47 %).