Data/hora: 05/06/2024 11:20:32

Biblioteca(s): 	Embrapa Unidades Centrais.	
Data corrente: 	30/06/2004	
Data da última atualização: 	27/08/2018	
Autoria: 	ARAÚJO, A. P.; FERNANDES, A. M.; KUBOTA, F. Y.; BRASIL, F. C.; TEIXEIRA, M. G.	
Afiliação: 	Adelson Paulo Araújo, Universidade Federal Rural do Rio de Janeiro - UFRRJ/Departamento de Solos; Aurélio Magno Fernandes, Universidade Federal Rural do Rio de Janeiro - UFRRJ/Departamento de Solos; Flavio Yuudi Kubota, Universidade Federal Rural do Rio de Janeiro - UFRRJ/Departamento de Solos; Felipe Costa Brasil, Universidade Federal Rural do Rio de Janeiro - UFRRJ/Departamento de Solos; Marcelo Grandi Teixeira, CNPAB.	
Título: 	Sample size for measurement of root traits on common bean by image analysis.	
Ano de publicação: 	2004	
Fonte/Imprenta: 	Pesquisa Agropecuária Brasileira, Brasília, DF, v. 39, n. 4, p. 313-318, abr. 2004	
Idioma: 	Inglês	
Notas: 	Título em português: Tamanho da amostra para determinação de caracteres radiculares do feijoeiro pela análise de imagens.	
Conteúdo: 	Evaluation of root traits may be facilitated if they are assessed on samples of the root system. The objective of this work was to determine the sample size of the root system in order to estimate root traits of common bean (Phaseolus vulgaris L.) cultivars by digital image analysis. One plant was grown per pot and harvested at pod setting, with 64 and 16 pots corresponding to two and four cultivars in the first and second experiments, respectively. Root samples were scanned up to the completeness of the root system and the root area and length were estimated. Scanning a root sample demanded 21 minutes, and scanning the entire root system demanded 4 hours and 53 minutes. In the first experiment, root area and length estimated with two samples showed, respectively, a correlation of 0.977 and 0.860, with these traits measured in the entire root. In the second experiment, the correlation was 0.889 and 0.915. The increase in the correlation with more than two samples was negligible. The two samples corresponded to 13.4% and 16.9% of total root mass (excluding taproot and nodules) in the first and second experiments. Taproot stands for a high proportion of root mass and must be deducted on root trait estimations. Samples with nearly 15% of total root mass produce reliable root trait estimates.	
Palavras-Chave: 	área radicular; comprimento radicular; root area; root length.	
Thesagro: 	Amostragem; Phaseolus Vulgaris.	
Thesaurus Nal: 	sampling.	
Categoria do assunto: 	--	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/AI-SEDE/26681/1/39n04a03.pdf	
Registro original: 	Embrapa Unidades Centrais (AI-SEDE)	
Exemplares: 	AI-SEDE - (26681-1) - UPE - AP - PP - 630.72081 - P474 -  - DIS