Residual recovery and yield performance of nitrogen fertilizer applied at sugarcane planting

Franco, Henrique Coutinho Junqueira, Otto, Rafael, Vitti, André Cesar, Faroni, Carlos Eduardo, Oliveira, Emídio Cantídio de Almeida, Fortes, Caio, Ferreira, Danilo Alves, Kölln, Oriel Tiago, Garside, Alan Leslie, and Trivelin, Paulo Cesar Ocheuze (2015) Residual recovery and yield performance of nitrogen fertilizer applied at sugarcane planting. Scientia Agricola, 72 (6). pp. 528-534.

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The low effectiveness of nitrogen fertilizer (N) is a substantial concern that threatens global sugarcane production. The aim of the research reported in this paper was to assess the residual effect of N-fertilizer applied at sugarcane planting over four crop seasons in relation to sugarcane crop yield. Toward this end three field experiments were established in the state of São Paulo, Brazil, during February of 2005 and July of 2009, in a randomized block design with four treatments: 0, 40, 80 and 120 kg ha−1 of N applied as urea during sugarcane planting. Within each plot, a microplot was established to which 15N-labeled urea was applied. The application of N at planting increased plant cane yield in two of the three sites and sucrose content at the other, whereas the only residual effect was higher sucrose content in one of the following ratoons. The combined effect was an increase in sugar yield for three of the 11 crop seasons evaluated. Over the crop cycle of a plant cane and three ratoon crops, only 35 % of the applied N was recovered, split 75, 13, 7 and 5 % in the plant cane, first, second and third ratoons, respectively. These findings document the low efficiency of N recovery by sugarcane, which increases the risk that excessive N fertilization will reduce profitability and have an adverse effect on the environment.

Item ID: 44394
Item Type: Article (Research - C1)
ISSN: 1678-992X
Keywords: Saccharum; urea; nitrogen fertilization; isotopic technique
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This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Funders: São Paulo State Foundation for Research Support (FAPESP)
Date Deposited: 15 Jun 2016 00:04
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0703 Crop and Pasture Production > 070302 Agronomy @ 100%
SEO Codes: 82 PLANT PRODUCTION AND PLANT PRIMARY PRODUCTS > 8203 Industrial Crops > 820304 Sugar @ 100%
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