Data/hora: 06/06/2024 13:15:44

Biblioteca(s): | Embrapa Semiárido.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | B - 2
Data corrente: | 09/01/2017
Data da última atualização: | 16/02/2017
Autoria: | CHAVES, A. R. de M.; SILVA, D. J.; AIDAR, S. de T.; SANTOS, L. M.; PRADO, K. A. C. de; COSTA, B. R. S.
Afiliação: | AGNALDO RODRIGUES DE MELO CHAVES, CPATSA; DAVI JOSE SILVA, CPATSA; SAULO DE TARSO AIDAR, CPATSA; LUCIANA MARTINS SANTOS, UPE; KARINNE ALBUQUERQUE CAMPOS DE PRADO, UPE; BRUNO RICARDO SILVA COSTA.
Título: | Potassium doses on the ecophysiological characteristics of Syrah grapevine grown at São Francisco River Valley, Brazil.
Ano de publicação: | 2016
Fonte/Imprenta: | Comunicata Scientiae, v. 7, n. 3, p. 362-371, 2016.
DOI: | 10.14295/CS.v7i3.1764
Idioma: | Inglês
Conteúdo: | The nutrients availability can lead to changes on grapevines physiological behavior, which results in a great importance of studies regarding the application of potassium doses. The aim of this research was to evaluate the ecophysiological behavior of grapevine cultivar ?Syrah? growing under different potassium doses by fertigation, according to the determination of gas exchange, chlorophyll a, fluorescence and pigments index. Five years old plants, grafted on ?Paulsen 1103? rootstock, in a trellis system and planted at the Bebedouro Experimental Field, located in Petrolina, PE, Brazil, were evaluated. The experiment was composed by five potassium doses (0, 20, 40, 80 and 160 kg ha-1), applied by fertigation. The potassium sources were potassium sulfate, potassium nitrate and potassium chloride. The evaluations of the ecophysiologyical parameters were performed at four different times (07am, 10am, 1pm and 3pm) throughout the day on the flowering stage and the first and second fruit growth stages, determining gas exchange and chlorophyll a fluorescence and the pigments index was evaluated at the same grapevines leaves one time. Considering each evaluation period, it was observed that, according to the magnitude of the results for gas exchange, chlorophyll a fluorescence and pigments index, is not possible to indicate the best potassium dose. The climatic conditions during each period of evaluation influenced most the eco-physiological variables than the applied potassium doses, while the changes on pigments index were due to leaves development during the plant cycle.
Palavras-Chave: | Chlorophyll a fluorescence; Ecofisiológia; Fluorescência da clorofila; Vale do São Francisco.
Thesagro: | Fisiologia vegetal; Fotossíntese; Potássio; Uva; Vitis Vinifera.
Thesaurus Nal: | Photosynthesis.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/155903/1/Agnaldo-2016.pdf
Registro original: | Embrapa Semiárido (CPATSA)
Exemplares: | CPATSA - (56255-1) - UPC - AP - DD -  -  -  - DIS