期刊
JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE
卷 175, 期 3, 页码 423-433出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jpln.201100022
关键词
nutrient turnover and transformation; dual inoculation; earthworms; PGPR; soil enzyme activity
资金
- Research Grants Council of Hong Kong [2002-PPR-3]
- Hong Kong Baptist University [RC/AOE/08-09/01]
Both earthworms and plant growthpromoting rhizobacteria (PGPR) are ubiquitous and important for promoting circulation of plant macronutrients. Two series of laboratory experiments were conducted to investigate the effects of earthworm casts and activities on the growth of PGPR, and the inoculation of earthworms and PGPR on the availability of N, P, and K in soils, respectively. During a short incubation period (034 h), the extracts of earthworm (Pheretima guillelmi)-worked soil significantly (p < 0.05) increased the abundance of the three species of PGPR, including N-fixing bacteria (NFB) (Azotobacter chroococcum HKN-5), phosphate-solubilizing bacteria (PSB) (Bacillus megaterium HKP-1), and K-solubilizing bacteria (KSB) (B. mucilaginous HKK-1), in Luria-Bertani (LB) broth. There were synergistic effects of dual inoculation of earthworms and PGPR on increasing the concentrations of NH4+-N, (NO3- + NO2-)-N, NaHCO3-extractable P, and NH4OAc-extractable K in the corresponding soils. Bioavailable N (the sum of NH4+-N and [NO3- + NO2-]-N) in the dual inoculation was 4 to 24 times those inoculated with earthworms or NFB alone, respectively. The significantly higher concentrations of bioavailable N and P in the dual inoculation of earthworms and NFB or PSB may be due to the higher abundance of PGPR and/or higher activities of urease and acid phosphatase than those of single inoculation of NFB or PSB, respectively. Dual inoculation of earthworms and PGPR would be most effective in reducing the need for chemical fertilizers in agriculture.
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