Promotion of the seedling growth of Nitraria schoberi L. in cultivating trays and seedling bags with seed priming

Nitraria schoberi plays an important role in restoration projects in arid areas of iran. improving the vegetative properties of this plant is critical to the success of these projects. this study was designed to achieve the best chemical, biological, and mechanical treatments to improve vegetative properties. the experiment was performed in a completely randomized design in two sections of cultivating trays and bags. chemical treatments were 1000, 2000, and 3000 ppm salicylic acid and gibberellic acid. biological treatments included azotobacter chroococcum, azospirillum lipoferum, bacillus megaterium, flavobacterium sp. and pseudomonas flourescens. the 24 khz wavelength of the ultrasonic device )for 5 minutes( formed a mechanical treatment. germination percent, seed vigor index, root and shoot length, seedling growth, fresh and dry weight of root, shoot and leaf number in both cultivating trays and seedling bags, and leaf area in cultivation trays and shoot diameter in seedling bags measured. according to the results, all traits were significantly different in cultivating trays (p ≤ 0.01) except for germination percent and shoot length. in seedling bags, seed vigor index, root length, seedling growth, root and shoot fresh weight, shoot dry weight, leaf fresh and dry weight, shoot diameter, number of leaves, and root to shoot ratio showed significant differences. there was no statistically significant difference between germination percent, shoot length, and root dry weight. maximum seed vigor index, root length, and leaf dry weight in both of the bags and trays were seen in 2000 ppm salicylic acid treatment. also, fresh weight of root and shoot, root dry and fresh weight, and the number of leaves in cultivating tray and in seedling bag root to shoot ratio, shoot diameter, and seedling growth in salicylic acid treatment 2000 ppm was seen. the most leaf area was in 1000 ppm salicylic acid treatment. azospirillum increased root, shoot and leaf fresh weight, leaf number and shoot dry weight in the seedling bag. results indicated that salicylic acid priming and seed inoculation with azospirillum are suitable for produce seedlings with better properties.