Data/hora: 09/06/2024 20:47:39

Biblioteca(s): | Embrapa Solos.
Data corrente: | 31/03/2014
Data da última atualização: | 14/10/2021
Autoria: | CHALK, P. M.; MAGALHÃES, A. M. T.; INACIO, C. de T.
Afiliação: | PHILLIP M. CHALK; ALBERTO M. T. MAGALHÃES; CAIO DE TEVES INACIO, CNPS.
Título: | Towards an understanding of the dynamics of compost N in the soil-plant-atmosphere system using 15N tracer.
Ano de publicação: | 2013
Fonte/Imprenta: | Plant and Soil, v. 362, n. 1/2, p. 373-388, Jan. 2013.
DOI: | https://doi.org/10.1007/s11104-012-1358-5
Idioma: | Inglês
Conteúdo: | Aims The principal aim of the present review is to synthesize and evaluate published information on the N fertilizer value of composts, and their effect on the utilization of conventional N fertilizers by crops. Methods We have examined the literature where the dynamics of N in the soil-plant-atmosphere continuum are traced using composts that were either artificially enriched in the 15N stable isotope (in units of atom % 15N excess) or had a natural 15N abundance (&#948;15N in units of ? or per mil) due to isotope discrimination processes that occur during composting. The methods used to produce artificially-enriched composts and to test uniformity of labelling are reviewed. Results Limited data show that composts are generally inferior sources of N for crops compared with their raw materials due to a lower N mineralization capacity. Immobilization of fertilizer N increases in compostamended soils and may reduce recovery by a crop, but fertilizer N losses are reduced overall. However, coapplication of compost and urea should be avoided due to the risk of increased NH3 volatilization due to the action of compost-derived urease. High annual rates of compost application can exacerbate environmental problems including nitrate contamination of groundwater. Conclusions Efforts are required to improve the N fertilizer value of composts by minimizing NH3 volatilization losses during composting. More attention should also be given to the use of the natural 15N abundance of compost as a tracer.
Palavras-Chave: | 15N; Compost; N fertilizers; N immobilization; N mineralization.
Thesaurus Nal: | nitrogen.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
Registro original: | Embrapa Solos (CNPS)
Exemplares: | CNPS - (18108-1) - UPC - AP - DD -  -  - 2014.00216 - DIS