期刊
MICROBES AND ENVIRONMENTS
卷 27, 期 3, 页码 257-262出版社
JAPANESE SOC MICROBIAL ECOLOGY, DEPT BIORESOURCE SCIENCE
DOI: 10.1264/jsme2.ME11309
关键词
biological nitrogen fixation; Elaeis guineensis Jacq.; inoculation; N-15 isotope dilution; PGPR
资金
- Ministry of Science, Technology and Innovation (MOSTI) [IRPA (EA): 09-02-04-0497-EA001]
There are increasing applications of diazotrophic rhizobacteria in the sustainable agriculture system. A field experiment on young immature oil palm was conducted to quantify the uptake of N derived from N-2 fixation by the diazotroph Bacillus sphaericus strain UPMB-10, using the N-15 isotope dilution method. Eight months after N-15 application, young immature oil palms that received 67% of standard N fertilizer application together with B. sphaericus inoculation had significantly lower N-15 enrichment than uninoculated palms that received similar N fertilizers. The dilution of labeled N served as a marker for the occurrence of biological N-2 fixation. The proportion of N uptake that was derived from the atmosphere was estimated as 63% on the whole plant basis. The inoculation process increased the N and dry matter yields of the palm leaflets and rachis significantly. Field planting of young, immature oil palm in soil inoculated with B. sphaericus UPMB-10 might mitigate inorganic fertilizer-N application through supplementation by biological nitrogen fixation. This could be a new and important source of nitrogen biofertilizer in the early phase of oil palm cultivation in the field.
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