Data/hora: 02/06/2024 03:41:27

Biblioteca(s): 	Embrapa Florestas.	
Data corrente: 	14/11/2019	
Data da última atualização: 	13/11/2023	
Autoria: 	ZANATTA, J. A.; VIEIRA, F. C. B.; BRIEDIS, C.; DIECKOW, J.; BAYER, C.	
Afiliação: 	JOSILEIA ACORDI ZANATTA, CNPF; FREDERICO COSTA BEBER VIEIRA, UNIVERSIDADE FEDERAL DO PAMPA; CLEVER BRIEDIS, BOLSISTA NA EMBRAPA INSTRUMENTAÇÃO; JEFERSON DIECKOW, UNIVERSIDADE FEDERAL DO PARANÁ; CIMÉLIO BAYER, UNIVERSIDADE FEDERAL DO RIO GRANDE DO SUL.	
Título: 	Carbon indices to assess quality of management systems in a Subtropical Acrisol.	
Ano de publicação: 	2019	
Fonte/Imprenta: 	Scientia Agricola, Piracicaba, v. 76, n. 6, p. 501-508, Nov./Dec. 2019.	
DOI: 	http://dx.doi.org/10.1590/1678-992X-2017-0322	
Idioma: 	Inglês	
Conteúdo: 	Management systems to improve soil quality are essential for agricultural and environmental sustainability. We assessed the quality of soil management systems applied to a subtropical Acrisol in terms of the carbon management index (CMI), the stratification ratio for total organic carbon (SR-TOC) and light fraction of organic matter (SR-LF). In addition, we examined their relationship to chemical, physical and biological soil quality indicators, as well as to maize yield. The study was conducted on a long-term experiment (18 years) in southern Brazil involving two different systems [no tillage (NT) and conventional tillage (CT)], two cropping systems [black oat/maize (O/M) and black oat + vetch/maize + cowpea (OV/MC)] and two nitrogen fertilizer rates for maize (0 and 180 kg ha?1). Based on the three indices, the best managements for soil quality comprised NT (50-212 % better than CT), legume cover crops (10-47 % better than O/M) and N fertilization (8-33 % better than no fertilizer). All three indices proved accurate to assess the impact of soil management systems, especially SR-LF, which showed increased sensitivity and close relationships with chemical, physical and biological soil quality indicators. On the other hand, a poor relationship was observed between soil C indices and maize yield, which was improved only by legume cover crops and N fertilization. The results showed that the association of no-till system to an abundant supply of crop residues is key to ensure high soil quality and crop yields in humid subtropical regions.	
Palavras-Chave: 	Agricultura conservativa; Conservation agriculture; No-till; Quality indicator.	
Thesagro: 	Carbono.	
Thesaurus Nal: 	Carbon; Cropping systems.	
Categoria do assunto: 	K Ciência Florestal e Produtos de Origem Vegetal	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/204739/1/2019-Josileia-SA-Carbon.pdf	
Registro original: 	Embrapa Florestas (CNPF)	
Exemplares: 	CNPF - (57086-1) - UPC - AP - DD -  -  -  - DIS