文献类型： 外文期刊

作者： Zhang Jun-hua ¹ ; Huang Jing ¹ ; Hussain, Sajid ¹ ; Zhu Lian-feng ¹ ; Cao Xiao-chuang ¹ ; Zhu Chun-quan ¹ ; Jin Qian-y ¹ ;

作者机构： 1.China Natl Rice Res Inst, State Key Lab Rice Biol, Hangzhou 310006, Peoples R China

2.Jiangsu Acad Agr Sci, Agr Resources & Environm Inst, Nanjing 210014, Peoples R China

关键词： N transformation; paddy soil; plant growth promoting rhizobacteria; rice productivity

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：2.848； 五年影响因子：2.979 ）

ISSN： 2095-3119

年卷期： 2021 年 20 卷 10 期

页码：

收录情况： SCI

摘要： Azospirillum brasilense and Pseudomonas fluorescens are well-known plant growth promoting rhizobacteria. However, the effects of A. brasilense and P. fluorescens on the N cycles in the paddy field and rice plant growth are little known. This study investigated whether and how A. brasilense and P. fluorescens contribute to the N transformations and N supply capacities in the rhizosphere, and clarified the effects of A. brasilense and P. fluorescens on the N application rate in rice cultivation. Inoculations with A. brasilense and P. fluorescens coupled with N application rate trials were conducted in the paddy field in 2016 and 2017. The inoculations of rice seedlings included four treatments: sterile saline solution (M-0), A. brasilense (M-b), P. fluorescens (M-p), and co-inoculation with a mixture of A. brasilense and P. fluorescens (Mbp). The N application rate included four levels: 0 kg N ha(-1) (N-0), 90 kg N ha(-1) (N-90), 180 kg N ha(-1) (N-180), and 270 kg N ha(-1) (N-270). The results indicated that the Mbp and Mp treatments significantly enhanced the ammonification activities in the rhizosphere compared with the M-0 treatment, especially for higher N applications, while the Mbp and Mb treatments greatly enhanced the nitrogenase activities in the rhizosphere compared with the M-0 treatments, especially for lower N applications. Azospirillum brasilense and P. fluorescens did not participate in the nitrification processes or the denitrification processes in the soil. The soil respiration rate and microbial biomass N were greatly affected by the interactions between the rhizobacteria inoculations and the N fertilizer applications. In the Mbp treatment, N supply capacities and rice grain yields showed no significant differences among the N9(0,) N(18)0, and N-270 applications. The N application rate in the study region can be reduced to 90 kg N ha(-1) for rice seedlings co-inoculated with a mixture of A. brasilense and P. fluorescens.