SABER-ULA, Universidad de Los Andes - Mérida - Venezuela >
Facultades >
Facultad de Ciencias >
Unidades de Investigación de la Facultad de Ciencias >
Institutos de Investigación >
Instituto de Ciencias Ambientales y Ecológicas (ICAE) >
Articulos, Pre-prints (Instituto de Ciencias Ambientales y Ecológicas (ICAE)) >


Título: The use of organic substrates with contrasting C/N ratio in the regulation of nitrogen use efficiency and lossesin a potato agroecosystem
Autores: Machado Díaz, Daniel
Sarmiento, Lina
Gonzalez-Prieto, S
Correo Electrónico: dmachado@ula.ve, machadod@cantv.net
lsarmien@ula.ve
serafin@iiag.csic.es
Editor: Nutrient Cycl Agroecosystems 88(3): 411–427
Resumen: The effect of the application of organic amendments of contrasting C/N ratio, combined with mineral N fertilizer, on the N budget of a potato crop was evaluated. The hypothesis was that the combination of substrates of contrasting chemical composition can improve the synchronization between N crop requirements and N availability in the soil, increasing yields and reducing losses to the environment.Potato plants were cultivated in microplots (0.225 m2) in the tropical uplands of Venezuela, using mineral N (labeled with 15N), poultry manure (C/N = 12), and rice hulls (C/N = 90) as N sources.Four treatments with the same total dose of N (25.0 g N m-2) were applied: (1) MF: mineral fertilizer; (2) P ? F: poultry manure and mineral fertilizer; (3) R ? F: rice hulls and mineral fertilizer and (4) P ? R ? F: poultry manure, rice hulls and mineral fertilizer. Labeled and nonlabeled N was measured in drained water and plant and soils compartments, and a N budget was established for each treatment. The ratio of N crop uptake to N losses was proposed as an ecological indicator of N use efficiency. The highest value (3.0) of this ratio was obtained in the treatment combining the two organic substrates of contrasting quality, P ? R ? F, followed by the R ? F (2.0) and P ? F (1.8) and the lowest ratio was obtained in the MF treatment (0.9). The P ? R ? F combination may represent a good soil amendment to obtain a high yield with a lower environmental impact, at least in the short-term. The generalization of these results to other soils and climates is discussed.
Fecha: 1-Dec-2010
País: Venezuela
Palabras Claves: Andes
N budget
Nitrogen-15
N use efficiency
Potato
Poultry manure
Rice hulls
Synchronization
Tropical mountains
Institución: Universidad de Los Andes
URI: http://www.saber.ula.ve/handle/123456789/39288
Aparece en colecciones:Articulos, Pre-prints (Instituto de Ciencias Ambientales y Ecológicas (ICAE))
Articulos, Pre-prints (Facultad de Ciencias)

Archivos en estos artículos:

Archivo Descripción TamañoFormato
Machado 2010.pdf544.63 kBAdobe PDFVer/Abrir

Todos los artículos en Dspace están protegidos con Derecho de Autor, todos los derechos reservados, a menos que se indique lo contrario.

 

Licencia Creative Commons
Todos los documentos publicados en este repositorio se distribuyen bajo una
Licencia Creative Commons Atribución-NoComercial-CompartirIgual 3.0 Venezuela.

Repositorio Institucional de la Universidad de Los Andes, Mérida, Venezuela - Comentarios
Software DSpace Copyright © 2002-2007 MIT and Hewlett-Packard -
DSpace Add-on Statistics of RepositóriUM © University of Minho.