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Effect of biochar applied with plant growth-promoting rhizobacteria (PGPR) on soil microbial community composition and nitrogen utilization in tomato

作者：

Yuan Wang;Wenqing Li;Binghai Du;Hanhao L

单位：

College of Life Sciences, Shandong Agricultural University, Tai’an 271018 (China);College of Resources and Environment, Shandong Agricultural University, Tai’an 271018 (China); National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Tai’an 271018 (China; National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Tai’an 271018 (China)

关键词：

biochar;pgpr;the u;treatment;ubp;u

摘要：

Plant growth-promoting rhizobacteria (PGPR) represent an important microbial community group and have beneficial effects on plant growth and development. A pot experiment was conducted to study the effect of biochar applied with PGPR on the soil microbial community composition and nitrogen use efficiency (NUE) of tomato, which could provide a theoretical basis for rational fertilization. Six treatments were designed: no nitrogen (N), PGPR, or biochar control (CK); biochar without N or PGPR (BCK); N without PGPR or biochar (U); N and PGPR without biochar (UP); N and biochar without PGPR (UB); and N, PGPR, and biochar (UBP). The tomato yield in the UP treatment was 9.09% lower than that in the U treatment, whereas that in the UB treatment was 19.93% higher than that in the U treatment. The tomato yield in the UBP treatment was 32.45%, 45.69%, and 10.44% higher than those in the U, UP, and UB treatments, respectively. Biochar combined with PGPR increased the relative abundance of Nitrospira and Bradyrhizobium in the soil. At the tomato maturity stage, the soil NO3–-N content in the UBP treatment was 87.12%, 88.12%, and 31.04% higher than those in the U, UP, and UB treatments, respectively. The NUE in the UP treatment was 4.03% lower than that in the U treatment, and that in the UBP treatment was 13.63%, 17.66%, and 10.77% higher than those in the U, UP, and UB treatments, respectively. This study showed that biochar combined with PGPR can improve soil microbial community structure and increase the NUE of tomato.

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Effect of biochar applied with plant growth-promoting rhizobacteria (PGPR) on soil microbial community composition and nitrogen utilization in tomato

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