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| Effects of Dipping Roots with Different Microbial Agents Concentrations on Quality of Tomato Seedlings |
| SONG Jianli1，LIU Xigang1，LI Jing1，2，3，YE Lin6，JI Tuo1，2，3，WEI Min1，3，ZHOU Bo4，5，YANG Fengjuan1，2，3* |
| 1College of Horticulture Science and Engineering，Shandong Agricultural University，Tai’an 271018，Shandong，China；2Key Laboratory of Biology and Genetic Improvement of Horticultural Crops（Huanghuai Region），Ministry of Agriculture and Rural Affairs，Tai’an 271018，Shandong，China；3Shandong Province Collaborative Innovation Center of Fruit and Vegetable，Tai’an 271018，Shandong，China；4College of Life Sciences，Shandong Agricultural University，Tai’an 271018，Shandong，China；5Eukaryotic Biotechnology（Shandong）Co.，Ltd.，Tai’an 271000，Shandong，China；6College of Wine and Horticulture，Ningxia University，Yinchuan 750021，Ningxia，China |
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Abstract By using ‘Ailvshi T147’ seedlings as the experimental materials，this study investigated the eff ect of diff erent concentrations of microbial agents（Brevibacillus laterosporus，Bacillus subtilis and Bacillus mucilaginosus in a volume ratio of 7∶2∶1）dipping roots treatment on the quality of tomato seedlings，to provide a theoretical basis for the application of microbial agents to the roots treatment during the transplanting stage．A total of 8 treatments were set up in this study：dipping roots in water（CK）and dipping roots with diff erent concentrations of microbial agents（diluted 300，400，500，600，700，1 000，and 1 500 times，respectively）．The results showed that the microbial agent treatments had a concentration eff ect，and as the dilution ratio increased，the growth of tomato seedlings in both aboveground and underground parts showed a trend of first increasing and then decreasing．The best dilution was 500 times．Under this treatment，the height，stem diameter，shoot fresh and dry weight，root fresh and dry weight，seedling index，root length，root surface area，root volume，and root vigor of tomato seedlings increased by 3.3%，18.9%，34.0%，31.3%，22.0%，114.3%，92.9%，22.2%，33.2%，45.5%，and 24.4% compared to CK，respectively，and the differences were significant．In summary，dipping the microbial agent diluted 500 times into the roots has a significant promoting effect on the growth of tomato seedlings．Before transplanting tomato seedlings，this concentration of microbial agent can be used to dip into the roots to promote tomato seedling growth．
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Received: 22 December 2023
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