Nitrogen acquisition and 15 N-fertiliser recovery efficiency of sugarcane cultivar RB92579 inoculated with five diazotro
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ORIGINAL ARTICLE
Nitrogen acquisition and 15N-fertiliser recovery efficiency of sugarcane cultivar RB92579 inoculated with five diazotrophs Willian Pereira . Renan Pedula Oliveira . Alisson Pereira . Jailson Silva Sousa . Nivaldo Schultz . Segundo Urquiaga . Veronica Massena Reis
Received: 9 March 2020 / Accepted: 20 October 2020 Ó Springer Nature B.V. 2020
Abstract We aimed to evaluate N acquisition and 15 N-fertiliser recovery efficiency of sugarcane as a function of N fertilisation and inoculation with plant growth-promoting diazotrophic bacteria (PGPDB) during the first crop season. A field experiment was performed with a randomized complete block design consisting of four replications and four treatments: control without N and without inoculation; control without N but with inoculation of a mixture of five strains of diazotrophic bacteria; N treatment Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10705-020-10100-x) contains supplementary material, which is available to authorized users. W. Pereira Universidade Federal Rural do Rio de Janeiro, Campus Campos dos Goytacazes, Est. do Ac¸u´car, s/n, Campos dos Goytacazes, Rio de Janeiro, CEP 28020-560, Brazil e-mail: [email protected] R. P. Oliveira Instituto de Agronomia, Departamento de Cieˆncia do Solo, Universidade Federal Rural do Rio de Janeiro, Rod. BR 465, Km 7, Serope´dica Rio de Janeiro, CEP 23890-000, Brazil e-mail: [email protected]
(50 kg ha-1 N-urea) without inoculation; and N treatment with inoculation. Over seven harvests, we evaluated crop growth, biomass accumulation, N content, and N recovery using 15N-urea (excess of 1.5% atoms 15N). In addition, the contribution of biological N fixation (BNF) was measured using the 15 N natural abundance technique in the plots without N fertiliser application. Inoculation with the mixture of five PGPDB strains increased the yield by 15% and N content in the shoots by 18% over the cycle. The average contribution of N fertiliser in plant N nutrition was 13%; other sources accounted for a large part of N in the shoots. Plants received N via BNF in 31% (average) of the treatments during the plant cycle; J. S. Sousa e-mail: [email protected] N. Schultz e-mail: [email protected] S. Urquiaga V. M. Reis (&) Embrapa Agrobiologia, Rodovia BR 465, Km 7, Serope´dica Rio de Janeiro, CEP 23890-000, Brazil e-mail: [email protected] S. Urquiaga e-mail: [email protected]
A. Pereira J. S. Sousa N. Schultz Universidade Federal Rural do Rio de Janeiro, Rio de Janeiro, Brazil e-mail: [email protected]
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Nutr Cycl Agroecosyst
however, inoculation did not interfere with this process. The recovery efficiency of 15N-fertiliser was 50% in this first cycle with no differences among inoculation treatments. Nitrogen fertiliser applied to sugarcane resulted in a low impact on N accumulation, and a single application of an inoculant improved plant growth by mechanisms other than BNF. Keywords
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