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The use of organic substrates with contrasting C/N ratio in the regulation of nitrogen use efficiency and lossesin a potato agroecosystem
dc.rights.license | http://creativecommons.org/licenses/by-nc-sa/3.0/ve/ | |
dc.contributor.author | Machado Díaz, Daniel | |
dc.contributor.author | Sarmiento, Lina | |
dc.contributor.author | Gonzalez-Prieto, S | |
dc.date.accessioned | 2014-11-06T18:38:53Z | |
dc.date.available | 2014-11-06T18:38:53Z | |
dc.date.issued | 2010-12-01 | |
dc.identifier.uri | http://www.saber.ula.ve/handle/123456789/39288 | |
dc.description.abstract | 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. | es_VE |
dc.language.iso | en | es_VE |
dc.publisher | Nutrient Cycl Agroecosystems 88(3): 411–427 | es_VE |
dc.rights | info:eu-repo/semantics/openAccess | |
dc.subject | Andes | es_VE |
dc.subject | N budget | es_VE |
dc.subject | Nitrogen-15 | es_VE |
dc.subject | N use efficiency | es_VE |
dc.subject | Potato | es_VE |
dc.subject | Poultry manure | es_VE |
dc.subject | Rice hulls | es_VE |
dc.subject | Synchronization | es_VE |
dc.subject | Tropical mountains | es_VE |
dc.title | The use of organic substrates with contrasting C/N ratio in the regulation of nitrogen use efficiency and lossesin a potato agroecosystem | es_VE |
dc.type | info:eu-repo/semantics/article | |
dc.description.email | dmachado@ula.ve, machadod@cantv.net | es_VE |
dc.description.email | lsarmien@ula.ve | es_VE |
dc.description.email | serafin@iiag.csic.es | es_VE |
dc.publisher.pais | Venezuela | es_VE |
dc.subject.facultad | Facultad de Ciencias | es_VE |
dc.subject.institucion | Universidad de Los Andes | es_VE |
dc.subject.thematiccategory | Biología | es_VE |
dc.subject.tipo | Artículos | es_VE |
dc.subject.unidadinv | Instituto de Ciencias Ambientales y Ecológicas (ICAE) | es_VE |
dc.type.media | Texto | es_VE |
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