Data/hora: 13/06/2024 05:00:06

Biblioteca(s): | Embrapa Unidades Centrais.
Data corrente: | 17/01/1997
Data da última atualização: | 11/09/2019
Autoria: | ALVAREZ, R.; SANTANATOGLIA, O. J.; DANIEL, P. E.; GARCIA, R.
Afiliação: | Roberto Alvarez, Universidad de Buenos Aires/Faculdad de Agronomoia/Laboratorio de Radioisótopos; Oscar José Santanatoglia, Universidad de Buenos Aires/Faculdad de Agronomoia/Laboratorio de Radioisótopos; Peter Engelbert Daniel, Universidad de Buenos Aires/Laboratorio de Radioisótopos; Roberto García, Instituto Nacional de Tecnologí­a Agropecuaria - INTA/Estación Experimental de Pergamino.
Título: | Respiration and specific activity of soil microbial biomass under conventional and recuced tillage.
Ano de publicação: | 1995
Fonte/Imprenta: | Pesquisa Agropecuária Brasileira, Brasília, DF, v. 30, n. 5, p. 701-709, maio 1995.
Idioma: | Inglês
Notas: | Título em português: Repiração e atividade específica da biomassa microbiana de um solo sob lavra convencional e reduzida.
Conteúdo: | The effects of two tillage systems, conventional (mold board plow) and reduced (harrow disk), on soil organic carbon and microbial biomass and activity were evaluated. Total organic carbon and microbial biomass were not affected by tillage, whereas carbon in the soil light fraction was higher in depth in plowed plots. Respiration os incubated samples and the specific ativity of the microbial biomass were also higher in subsurface soil under conventional tillage. This was associated (r=0,80) with carbon availability as indicated by the ratio light fraction-C/biomass-C. the CO2-C produced by the soil was originated from both a labile and a resistant pool. Conventional tillage determined an increase of the labile one. The CO2-C production in hte field was positively correlated with soil temperature and rainfall (r2=78-89). During summer, plowed plots generated 44% more CO2-C than umplowed ones. Plowing increased the available carbon pool size for microorganisms in depth but had no effect on CO2-C emission to the atmosphere on a year basis.
Palavras-Chave: | Amostras incubadas; Carbono organico; Harrow disk; Incubated samples; Organic carbon; Plow.
Thesagro: | Arado; Grade de Disco; Matéria Orgânica.
Thesaurus Nal: | organic matter.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/AI-SEDE/19432/1/pab16_maio_95.pdf
Registro original: | Embrapa Unidades Centrais (AI-SEDE)
Exemplares: | AI-SEDE - (19432-1) - UPE - AP - PP - 630.72081 - P474 -  - DIS