| Texto completo | |
| Autor(es): |
Bruno, Isabeli Pereira
[1]
;
Reichardt, Klaus
[2]
;
Bortolotto, Rafael Pivotto
[1]
;
Pinto, Victor Meriguetti
[2]
;
Santos Bacchi, Osny Oliveira
[2]
;
Dourado-Neto, Durval
[1]
;
Unkovich, Murray John
[3]
Número total de Autores: 7
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Escola Super Agr Luiz de Queiroz, Dept Crop Prod, BR-13418900 Piracicaba - Brazil
[2] Univ Sao Paulo, Ctr Nucl Energy Agr, Lab Soil Phys, BR-13418900 Piracicaba - Brazil
[3] Univ Adelaide, Sch Agr Food & Wine, Adelaide, SA - Australia
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF PLANT NUTRITION; v. 38, n. 13, p. 2055-2076, NOV 10 2015. |
| Citações Web of Science: | 6 |
| Resumo | |
Brazil is a major world coffee producer, using increasing quantities of nitrogen (N) fertilizer as the monoculture expands across the savannas. The fate and efficiency of this fertilizer N were evaluated for one complete cropping cycle using N-15 tracer, permitting an N balance at harvest. Annual rates of 200, 400, 600, and 800kg N ha(-1) year(-1) of N-15-labeled urea and an unfertilized control were applied every 14days via fertigation. The N concentration, percentage of N derived from fertilizer, quantity of N derived from fertilizer, and percentage of nitrogen derived from fertilizer per N rate was assessed for 8-year-old coffee trees. The most efficient N use was with 200kg ha(-1) year(-1) because it presented the lowest losses and highest N recoveries in the crop. Conversely, the least sustainable rate was 800kg ha(-1) year(-1), which presented the greatest losses and the lowest N recovery in the whole plant. (AU) | |