Data/hora: 30/05/2024 02:35:43

Biblioteca(s): | Embrapa Agrobiologia.
Data corrente: | 22/03/2021
Data da última atualização: | 05/10/2021
Autoria: | PEREIRA, W.; OLIVEIRA, R. P.; PEREIRA, A.; SOUZA, J. S.; NIVALDO, S.; URQUIAGA, S.; REIS, V. M.
Afiliação: | WILLIAM PEREIRA, UFRRJ; UFRRJ; ALISSON PEREIRA, UFRRJ; JAILSON SILVA SOUSA, UFV; NIVALDO SCHULTZ, UFRRJ; SEGUNDO SACRAMENTO U CABALLERO, CNPAB; VERONICA MASSENA REIS, CNPAB.
Título: | Nitrogen acquisition and 15N-fertiliser recovery efficiency of sugarcane cultivar RB92579 inoculated with five diazotrophs.
Ano de publicação: | 2021
Fonte/Imprenta: | Nutrient Cycling in Agroecosystems, v. 119, p.37-50, 2021.
ISSN: | 1385-1314
Idioma: | Inglês
Conteúdo: | We aimed to evaluate N acquisition and 15N-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 (50 kg ha&#8722;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 15N 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; 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.
Palavras-Chave: | 15N fertiliser; Diazotrophic bacteria.
Thesaurus Nal: | Isotopes; Sugarcane.
Categoria do assunto: | S Ciências Biológicas
Registro original: | Embrapa Agrobiologia (CNPAB)
Exemplares: | CNPAB - (41682-1) - UPC - AP - DD -  -  -  - DIS