Data/hora: 21/06/2024 17:46:19

Biblioteca(s): 	Embrapa Arroz e Feijão.	
Data corrente: 	22/02/2017	
Data da última atualização: 	04/12/2017	
Autoria: 	SILVEIRA, P. M. da; GONZAGA, A. C. de O.	
Afiliação: 	PEDRO MARQUES DA SILVEIRA, CNPAF; AUGUSTO CESAR DE OLIVEIRA GONZAGA, CNPAF.	
Título: 	Portable chlorophyll meter can estimate the nitrogen sufficiency index and levels of topdressing nitrogen in common bean.	
Ano de publicação: 	2017	
Fonte/Imprenta: 	Pesquisa Agropecuária Tropical, Goiânia, v. 47, n. 1, p. 1-6, jan./mar. 2017.	
ISSN: 	1983-4063	
DOI: 	10.1590/1983-40632016v4742128	
Idioma: 	Inglês	
Conteúdo: 	The nitrogen sufficiency index (NSI) obtained by using a portable chlorophyll meter is a practical alternative to evaluate the N levels in plants. This study aimed at determining the appropriate NSI value for leaves of common bean plants, in order to define the need and amount of N to be applied as topdressing, using the Minolta SPAD-502 portable chlorophyll meter. Three field experiments were conducted using a randomized blocks design, with four replications. Nitrogen doses were applied as topdressing and compared with a treatment in which a high dose of N was used as a reference to calculate the NSI, whose value was 95 %. According to the results observed using the chlorophyll meter and the NSI, for each 0.1 percentage point increase in the NSI to reach the adequate level (95 %), it is necessary to apply 1.1-1.5 kg ha-1 of topdressing N.	
Palavras-Chave: 	Adubação nitrogenada; SAPD-502.	
Thesagro: 	Feijão; Fertilizante nitrogenado; Phaseolus vulgaris.	
Thesaurus Nal: 	Beans; Nitrogen fertilizers.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/156468/1/CNPAF-2017-pat.pdf	
Registro original: 	Embrapa Arroz e Feijão (CNPAF)	
Exemplares: 	CNPAF - (34641-1) - UPC - AP - DD - 2017 -  - 2017 - DIS