Data/hora: 18/06/2024 16:39:50

Biblioteca(s): 	Embrapa Agrobiologia.	
Data corrente: 	24/07/2001	
Data da última atualização: 	24/07/2001	
Autoria: 	NDIAYE, E. L.; SANDENO, J. M.; MCGRATH, D.; DICK, R. P.	
Título: 	Integrative biological indicators for detecting change in soil quality.	
Ano de publicação: 	2000	
Fonte/Imprenta: 	American Journal of Alternative Agriculture, Greenbelt, v. 15, n. 1, p. 26-36, 2000.	
Idioma: 	Inglês	
Conteúdo: 	To promote agricultural sustainability, there is a growing interest in developing soil quality indicators that can be used as early indicators of changes in management practices by growers agricultural professionals, and  researchers. A study was conducted on four commercial growers fields and two research stations in western Oregon with that had been started from 1 to 7 years prior to initiating the investigation. The primary comparison at each site was a winter cover crop and winter fallow in rotation with summer vegetable crops. The effects of these treatments on microbial biomass carbon (MBc), mineralizable N, soil enzyme activity (arylsulfatase and B-glucosidase), and cotton strip decomposition were analyzed to monitor changes in soil quality over a 2-year period. The cotton strip method was tested because of its simplicity (buried in soil for short periods and then assessed for tensile strength or weight loss) and potential as a soil biological indicator. Results showed that cover cropping significantly affected MBc and soil enzyme activity. Mineralizable N and CO2 respiration (laboratory incubation) did not respond to winter cover crop treatment. Cotton strip decomposition was relatively ensensitive to field treatments. Because MBc and B-glucosidase activity responded quickly to field management treatment and were less variable than the other measurements, they showed the most potential as soil quality indicators. Total C (organic matter index) and extractable nutrients were not significantly affected by cover cropping (even after 7 years), indicanting selected biological  properties are superior to these chemical properties for detecting effects of soil management. 	
Palavras-Chave: 	Atividade Engimica; Biomassa microbiana; N; Quality.	
Thesagro: 	Cobertura do Solo; Mineralização; Nitrogênio; Qualidade; Solo.	
Thesaurus Nal: 	cover crops; enzyme activity; microbial biomass; mineralization; nitrogen; soil.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Agrobiologia (CNPAB)	
Exemplares: 	CNPAB - (24611-1) - ADD - SP - -- -  -  - 22421 - DIS