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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

NITROGEN BALANCE AND FERTIGATION USE EFFICIENCY IN A FIELD COFFEE CROP

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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: 5
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)