Organic farming (OF) has been increasing in popularity over recent years, but unfortunately tends to have lower yield, due to lower nutrient availability and pest problems. To better understand how OF influences plant growth, we must elucidate the impact of such practices on the microbial community, an important factor in soil management. In this study, we examined the relationship between farming practice, changes in plant growth, and soil microbial community for green onion (Allium fistulosum L.) cultivated over 313 days in green houses with OF using composts with natural green tuff as soil conditioner (EF1) or inorganic fertilizer (EF2). Average yields of EF1 were generally higher than EF2, reaching up to 12% higher (p < 0.05; day 131). The observed soil microorganism phylotypes and phylogenetic diversity (Faith’s phylogenetic diversity (PD)) were both significantly higher (p < 0.05) in EF1 than EF2 on days 93, 191 (only for PD), and 261, based on microbial richness indices. Several phylotypes belonging to the Bacillus-related microbial order Bacillales were found at higher abundances in EF1 soils, positively correlated with specific soil properties (i.e., humus, ammonium, and pH), and may associate with plant growth promotion and/or fungal toxin degradation. These results point towards novel positive effects of OF and provide insights into the management of soil microorganisms using organic fertilizers.

中文翻译：

---

绿凝灰肥料的施用对大葱栽培土壤微生物，植物生长和土壤化学参数的影响

近年来，有机耕作（OF）的普及程度不断提高，但不幸的是，由于养分利用率较低和病虫害，单产降低了。为了更好地了解OF如何影响植物生长，我们必须阐明这种做法对微生物群落的影响，微生物群落是土壤管理的重要因素。在这项研究中，我们研究了在OF中使用天然凝灰岩堆肥作为土壤改良剂（EF1）在OF的温室中种植超过313天的葱（Allium fistulosum L.）的耕作方式，植物生长变化和土壤微生物群落之间的关系。）或无机肥（EF2）。EF1的平均产量通常高于EF2，最高可提高12％（p<0.05；第131天）。根据微生物丰富度指数，在第93、191天（仅针对PD）和261天，EF1中观察到的土壤微生物系统型和系统发育多样性（Faith系统发育多样性（PD））均显着高于EF2 （p <0.05）。属于几个种系型芽孢杆菌-相关的微生物为了芽孢杆菌是在EF1土壤，与特定的土壤性能（即，腐殖质，铵，和pH下）正相关发现在较高的丰度，并且可以与植物生长促进和/或真菌毒素降解相关联。这些结果指出了OF的新颖积极作用，并为使用有机肥料管理土壤微生物提供了见识。