Data/hora: 03/06/2024 07:54:40

Biblioteca(s): | Embrapa Pesca e Aquicultura.
Data corrente: | 15/05/2018
Data da última atualização: | 05/02/2019
Autoria: | OLIVEIRA, S. M. de; ALMEIDA, R. E. M. de; CIAMPITTI, I. A.; PIEROZAN JUNIOR, C.; LAGO, B. C.; TRIVELIN, P. C. O.; FAVARIN, J. L.
Afiliação: | SILAS MACIEL DE OLIVEIRA, ESALQ; RODRIGO ESTEVAM MUNHOZ DE ALMEIDA, CNPASA; IGNACIO A. CIAMPITTI, KANSAS STATE UNIVERSITY; CLOVIS PIEROZAN JUNIOR, ESALQ; BRUNO COCCO LAGO, ESALQ; PAULO CESAR OCHEUZE TRIVELIN, CENA; JOSE LAERCIO FAVARIN, ESALQ.
Título: | Understanding N timing in corn yield and fertilizer N recovery: an insight from an isotopic labeled-N determination.
Ano de publicação: | 2018
Fonte/Imprenta: | PLoS One, v. 13, n. 2, e0192776, Feb. 2018.
ISSN: | 1932-6203
DOI: | 10.1371/journal.pone.0192776
Idioma: | Inglês
Conteúdo: | Early fertilizer nitrogen (N) application on cover crops or their residues during the off-season is a practice adopted in Brazil subtropical conditions under no-tillage corn (Zea mays L.) systems. However, the effect of early N application on yield, plant N content, and N recovery efficiency (NRE) for corn is not yet well documented. Five fertilizer N timings in an oat-corn system were evaluated in two studies utilizing an isotopic-labeled N determination, 15N isotope. The N fertilization timings were: (i) oat tillering, (ii) 15 days before corn planting time, over the oat residues, (iii) at corn planting time, (iv) in-season at the three-leaf growth stage (V3), and (v) in-season split application at V3 and six-leaf (V6) growth stages. Based on the statistical analysis, the N fertilization timings were separated into three groups: 1) N-OATS, designated to N applied at oat; 2) N-PLANT, referred to pre-plant and planting N applications; and 3) N-CORN, designated to in-season corn N applications. Corn yield was not affected by the N fertilization timing. However, the N-CORN N fertilization timings enhanced NRE by 17% and 35% and final N recovery system (plant plus soil) by 16% and 24% all relative to N-OATS and N-PLANT groups, respectively. Overall, N-OATS resulted in the largest N derived from fertilizer (NDFF) amount in the deeper soil layer, in overall a delta of 10 kg N ha-1 relative to the rest of the groups. Notwithstanding corn yield was not affected, early N fertilization under subtropical conditions is not a viable option since NRE was diminished and the non-recovery N increased relative to the in-season N applications.
Thesagro: | Fertilizante Nitrogenado; Milho; Planta de Cobertura; Plantio Direto; Zea Mays.
Thesaurus Nal: | Corn; Cover crops; Nitrogen fertilizers; No-tillage.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/176845/1/CNPASA-2018-plosone.pdf
Registro original: | Embrapa Pesca e Aquicultura (CNPASA)
Exemplares: | CNPASA - (674-1) - UPC - AP - DD - CNPASA_AP17 -  - 2018.017 - DIS