Inoculation with beneficial microbes has been proposed as an effective practice for the improvement of plant growth and soil health. Since soil acts as a physicochemical background for soil microbial communities, we hypothesized that its management will mediate the effects of microbial inoculants on the indigenous soil microbes. We examined the effects of bacterial inoculants [Bacillus subtilis (Ba), Pseudomonas fluorescens (Ps), and both (BaPs)] on the growth of Lactuca sativa cultivated in soils that originated from an organic maize (OS) and a conventional barley (CS) management system. Moreover, the biomass and the community structure of the rhizosphere microbial communities and the soil enzyme activities were recorded. The root weight was higher in CS than OS, while the foliage length was greater in OS than CS treatments. Only in OS pots, inoculants resulted in higher biomasses of bacteria, fungi, and actinomycetes compared to the control with the highest values being recorded in Ps and BaPs treated soils. Furthermore, different inoculants resulted in different communities in terms of structure mainly in OS soils. For soil enzymes, the effect of the management system was more important due to the high organic matter existing in OS soils. We suggest that for microbial inoculation to be effective it should be considered together with the management history of the soil.

中文翻译：

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枯草芽孢杆菌和荧光假单胞菌接种对莴苣（Lactuca sativa L.）土壤根际微生物群落属性的影响：管理系统的作用

已经提出用有益微生物接种是改善植物生长和土壤健康的有效实践。由于土壤是土壤微生物群落的理化背景，我们假设对土壤的管理将介导微生物接种剂对本地土壤微生物的影响。我们检查了细菌接种剂[枯草芽孢杆菌（Ba），荧光假单胞菌（Ps）和两者（BaPs）]对紫花苜蓿生长的影响种植在源自有机玉米（OS）和常规大麦（CS）管理系统的土壤中。此外，还记录了根际微生物群落的生物量和群落结构以及土壤酶活性。CS中的根重高于OS，而OS中的叶长大于CS处理。与对照相比，仅在OS盆中，接种物导致细菌，真菌和放线菌的生物量更高，在Ps和BaPs处理的土壤中记录到最高值。此外，不同的孕育剂导致的群落结构主要在OS土壤中也不同。对于土壤酶，由于OS土壤中存在高有机质，因此管理系统的效果更为重要。