Data/hora: 20/06/2024 03:32:49

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