There is increased interest by the agricultural industry in microbial amendments that leverage natural beneficial interactions between plants and soil microbes to improve crop production. However, translating fundamental knowledge from laboratory experiments into efficient field application often has mixed results, and there is less clarity about the interaction between added microbes and the native microbial community, where microorganisms belonging to the same phylogenic clades often reside. In this study, four commercially available microbial amendments were examined in two greenhouse experiments using field soil to assess their impact on tomato plant growth and the native soil microbial communities. The amendments contained different formulations of plant growth-promoting bacteria (Lactobacilli, Rhizobia, etc.), yeasts, and mycorrhizal fungi. The application of the tested amendments in greenhouse conditions resulted in no significant impact on plant growth. A deeper statistical analysis detected variations in the microbial communities that accounted only for 0.25% of the total species, particularly in native taxa not related to the inoculated species and represented less than 1% of the total variance. This suggests that under commercial field conditions, additional confounding variables may play a role in the efficacy of soil microbial amendments. This study confirms the necessity of more in-depth validation requirements for the formulations of soil microbial amendments before delivery to the agricultural market in order to leverage their benefits for the producers, the consumers, and the environment.

中文翻译：

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土壤微生物改良剂对田间土壤中番茄根际微生物组和植物生长的影响。

农业工业对利用植物与土壤微生物之间的自然有益相互作用来改善作物产量的微生物改良剂的兴趣日益增加。但是，将实验室实验中的基础知识转化为有效的现场应用通常会产生不同的结果，并且关于添加微生物与原生微生物群落之间相互作用的清晰性尚不明确，而属于同一进化进化枝的微生物通常会在那里居住。在这项研究中，在两个温室实验中使用田间土壤检查了四种市售微生物改良剂，以评估其对番茄植物生长和原生土壤微生物群落的影响。修正案包含不同配方的植物生长促进细菌（乳酸杆菌，根瘤菌等），酵母菌和菌根真菌。在温室条件下应用经过测试的修正案不会对植物生长产生重大影响。更深入的统计分析发现，微生物群落中的变异仅占总物种的0.25％，特别是与被接种物种无关的天然生物分类中的变异，其不足总变异的1％。这表明在商业田间条件下，其他混杂变量可能在土壤微生物改良剂的功效中起作用。这项研究证实了在向农业市场交付之前，需要对土壤微生物改良剂的配方进行更深入的验证，以充分利用其对生产者，消费者和环境的好处。