Data/hora: 24/06/2024 05:27:11

Biblioteca(s): 	Embrapa Arroz e Feijão; Embrapa Pecuária Sudeste.	
Data corrente: 	28/10/2009	
Data da última atualização: 	17/05/2022	
Autoria: 	MACHADO, P. L. O. A.; BERNARDI, A. C. C.; ORTIZ VALENCIA, L. I.; MEIRELLES, M. S. P.; SILVA, C. A.; GIMENEZ, L. M.; MOLIN, J. P.; MADARI, B. E.	
Afiliação: 	PEDRO LUIZ OLIVEIRA DE A MACHADO, CNPAF; ALBERTO CARLOS DE CAMPOS BERNARDI, CPPSE; L. I. ORTIZ VALENCIA, UFRJ; MARGARETH SIMOES P MEIRELLES, CNPS; C. A. SILVA, UFLA; L. M. GIMENEZ, FUNDAÇÃO ABC/CASTRO, PR; J. P. MOLIN, ESALQ; BEATA EMOKE MADARI, CNPAF.	
Título: 	Carbon stocks of a Rhodic Ferralsol under no-tillage in Southern Brazil: spatial variability at a farm scale.	
Ano de publicação: 	2009	
Fonte/Imprenta: 	Australian Journal of Soil Research, v. 47, n. 3, p. 253-260, May 2009.	
Idioma: 	Inglês	
Conteúdo: 	The objective of this study was to determine, at a farm level, the spatial variability of organic carbon stock (CS) at different depths on a field of 1 soil type in long-term (13-year) crop production under no-tillage. The crop rotation comprised soybean [Glycine max (L.) Merr.] alternating with maize (Zea mays L.) in the summer season. For the winter season, wheat (Triticum aestivum L.) was cropped in rotation with black oat (Avena sativa L.), a cover crop. The 12.5-ha field was sampled at a density of 6.25 samples/ha. Within the coarse grid, 2 dense grids with 20-, 10-, and 5-m spacing were established. Soil samples were collected at all grid nodes and analysed for soil organic carbon and bulk density. The CS at 0-0.05, 0.05-0.10, and 0.10-0.20m was corrected for equal soil mass. Geostatistics was used for the estimation of spatial distribution of CS at 3 soil depths. We found that CS variation was low to medium (CV 6.7-19.4%). The variograms of CS at all depths were best fitted by spherical models and showed ranges of 120m, except at 0-0.05m (range 109m). At 0-0.20m depth, CS was 15.2-24.5t/ha (CV 8.2%, range 120m). The use of geostatistics reveals a powerful tool for the spatial estimation of CS at depth of a Rhodic Ferralsol under no-tillage, and demonstrated CS variation on a 12.5-ha area, even though soil and crop management were the same for >10 years..	
Palavras-Chave: 	Brasil; Organic carbon; Soil organic.	
Thesagro: 	Carbono; Matéria orgânica; Milho; Plantio direto; Rotação de cultura; Solo; Textura do solo; Trigo.	
Thesaurus Nal: 	Corn; crop rotation; geostatistics; No-tillage; soil; Soil organic carbon; Soil organic matter; soil texture; Wheat.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Arroz e Feijão (CNPAF)	
Exemplares: 	CPPSE - (18699-1) - UPC - AP - DD - PROCI-2009.00125 - MAC - 2009.00125 - DIS
CNPAF - (29335-1) - UPC - AP - DD - 2009 -  - 2009 - DIS