Bali Rana, Pineault Jonathan, Chagnon Pierre-Luc, Hijri Mohamed
Institut de Recherche en Biologie Végétale (IRBV), Université de Montréal, 4101 Rue Sherbrooke Est, Montréal, QC H1X 2B2, Canada.
Écomestible Inc., 470 Rue Constable, McMasterVille, QC J3G 1N6, Canada.
Plants (Basel). 2021 Aug 10;10(8):1638. doi: 10.3390/plants10081638.
Soil bacteria drive key ecosystem functions, including nutrient mobilization, soil aggregation and crop bioprotection against pathogens. Bacterial diversity is thus considered a key component of soil health. Conventional agriculture reduces bacterial diversity in many ways. Compost tea has been suggested as a bioinoculant that may restore bacterial community diversity and promote crop performance under conventional agriculture. Here, we conducted a field experiment to test this hypothesis in a soybean-maize rotation. Compost tea application had no influence on bacterial diversity or community structure. Plant growth and yield were also unresponsive to compost tea application. Combined, our results suggest that our compost tea bacteria did not thrive in the soil, and that the positive impacts of compost tea applications reported elsewhere may be caused by different microbial groups (e.g., fungi, protists and nematodes) or by abiotic effects on soil (e.g., contribution of nutrients and dissolved organic matter). Further investigations are needed to elucidate the mechanisms through which compost tea influences crop performance.
土壤细菌驱动着关键的生态系统功能，包括养分活化、土壤团聚以及作物对病原体的生物保护。因此，细菌多样性被视为土壤健康的关键组成部分。传统农业通过多种方式降低细菌多样性。堆肥茶被认为是一种生物接种剂，可能会恢复传统农业下的细菌群落多样性并促进作物生长。在此，我们进行了一项田间试验，以在大豆 - 玉米轮作中验证这一假设。施用堆肥茶对细菌多样性或群落结构没有影响。植物生长和产量对堆肥茶的施用也没有反应。综合来看，我们的结果表明，我们的堆肥茶细菌在土壤中无法良好生长，其他地方报道的堆肥茶施用的积极影响可能是由不同的微生物群体（如真菌、原生生物和线虫）或土壤的非生物效应（如养分和溶解有机物的贡献）引起的。需要进一步研究以阐明堆肥茶影响作物生长的机制。
