Increase in potato yield by the combined application of biochar and organic fertilizer: key role of rhizosphere microbial diversity

作者：Jianwei Hou, CunFang Xing, Jun Zhang, Zuhua Wang, Min Liu, Duan Yu, Hui Zhao · 发表于：Frontiers in Plant Science · 年份：2024 · DOI：10.3389/fpls.2024.1389864 · 被引用次数：24 · 研究领域：Potato Plant Research、Soil Carbon and Nitrogen Dynamics、Plant-Microbe Interactions and Immunity

Purpose The large-scale planting of potatoes leads to soil degradation, thus limiting the potato yield. An effective method of improving soil quality involves the combined application of biochar and organic fertilizer. However, the proportion of biochar and organic fertilizer at which potato yield can be improved, as well as the improvement mechanism, remain unclear. Methods A combined application experiment involving biochar (B) and organic fertilizer (O) with four concentration gradients was conducted using the equal carbon ratio method. On this basis, rhizosphere soil fertility, bacterial community composition, and bacterial diversity in potato crops, as well as the potato yield difference under different combined application ratios, were investigated. Then, the direct and indirect effects of these factors on potato yield were analyzed. Results The results suggest that soil fertility was improved by the combined application of biochar and organic fertilizer, with the best effect being achieved at a ratio of B:O=1:2. The dominant bacterial communities in the potato rhizosphere included Proteobacteria , Actinobacteria , Gemmatimonadetes , Chloroflexi , and Bacteroidetes . When compared to the control, the relative abundance and diversity index of soil bacteria were significantly improved by the treatment at B:O=1:2, which exerted a stronger effect on improving the relative abundance of beneficial bacteria. Soil available phosphorus (AP), soil pH (SpH), and soil organic carbo...