Data/hora: 29/06/2024 09:48:10

Biblioteca(s): | Epagri-Sede.
Data corrente: | 12/09/2005
Data da última atualização: | 12/09/2005
Autoria: | ALTLAND, J.E.; GILLIAM, C.H.; KEEVER, G.J.; EDWARDS, J.H.; SIBLEY, J.L.; FARE, D.C.
Título: | Rapid Determination of Nitrogen Status in Pansy.
Ano de publicação: | 2003
Fonte/Imprenta: | Hortscience, Alexandria, v.38, n.4, 2003. CD-ROM.
Idioma: | Inglês
Conteúdo: | Two experiments were conducted with pansy (Viola ×wittrockiana Gams ?Bingo Yello?) to determine the relationship between foliar nitrogen (% of dry weight) (FN) and either sap nitrate concentration (SN) in petioles or SPAD readings of foliage. FN was highly correlated to SN throughout both experiments (r = 0.80 to 0.91). FN was poorly correlated to SPAD readings early in both experiments (r = 0.54 to 0.65), but more highly correlated later when visual symptoms of N deficiency were apparent (r = 0.84 to 0.90). SN determined with the Cardy sap nitrate meter was a reliable predictor of FN in pansy, while SPAD readings were only reliable after symptoms of N deficiency were visually evident. FN can be predicted with SN using the following equation: log(SN) = 0.47*FN + 1.6 [r2 = 0.80, n = 132]. Growers and landscape professionals can use SN readings to predict FN levels in pansy, and thus rapidly and accurately diagnose the N status of their crop.
Palavras-Chave: | Amor-perfeito; Cardy nitrate meter; Landscape crops; Nitrate; Nitrogenio; Planta de vaso; Potted plant production; Producao.
Categoria do assunto: | --
Registro original: | Epagri-Sede (Epagri-Sede)
Exemplares: | Epagri-Sede - (40511-1) - ADD - AP - -- - CD 0044/05 -  - 2005.17409 - DIS