Journal
PLANT AND SOIL
Volume 454, Issue 1-2, Pages 155-169Publisher
SPRINGER
DOI: 10.1007/s11104-020-04621-1
Keywords
N-15 natural abundance; Bacterial inoculant; Biological N(2)fixation; Sugarcane; Plant growth promotion
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Funding
- Embrapa
- National Council for Scientific and Technological Development (CNPq) [INCT 465133/2014-2]
- Newton Fund [B/N012476/1]
- UK Biotechnology and Biological Sciences Research Council (BBSRC)
- Brazilian National Council for State Funding Agencies (CONFAP)
- CAPES (Ministry of Education)
- program Cientista de Nosso Estado from the Carlos Chagas Rio State Research Foundation (FAPERJ)
- CNPq
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Aims This study was performed to determine if the contribution of biological N(2)fixation (BNF) associated with Brazilian sugarcane cultivars could be increased by the inoculation with N-2-fixing bacteria. Methods The field experiment was planted with two sugarcane cultivars, inoculated or not, with five N-2-fixing bacteria. All plant tissues, including belowground, were harvested for determination of dry matter, N accumulation and(15)N abundance at five occasions until 450 days after planting. Results Inoculation significantly increased total N accumulation in the aerial tissue of cultivar RB867515 from 147 to 199 kg N ha(-1)and cultivar RB92579 from 126 to 192 N kg ha(-1). At final harvest(15)N abundances of entire sugarcane plants compared to that of plant-available N indicated that BNF inputs were over 64%. Total N derived from BNF and the soil was increased by inoculation, by 50 and 17 kg N ha(-1)and 36 and 67 kg N ha(-1), for the two cultivars respectively. Conclusions Without inoculation, the two sugarcane cultivars obtained over 65% of N from BNF. Inoculation with the five component inoculant increased N accumulation from soil and BNF but with little impact on the proportion of N derived from BNF.
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