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Plant water status indicators for irrigation scheduling associated with iso- and anisohydric behavior: vine and plum trees
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Orientador(es)
Resumo(s)
Plant water status indicators have been increasingly used for scheduling irrigation.
Different variables may be used to do this, depending on personal preferences and the resources
available. Many studies have suggested that selection of an indicator should take into account
plant behavior in relation to isohydricity. In two Iberian studies, deficit irrigation (DI) was applied
in a vineyard and in a plum orchard while plant water status and fluxes were monitored. These
case-studies are discussed with special focus on the use of predawn leaf water potential (Ypd) versus
stem water potential (Yst) to determine whether Yst performed better and would therefore be the
preferred stress indicator for plants exhibiting anisohydric behavior. In contrast, in plants with
isohydric behavior, Ypd would be generally preferred. This hypothesis seems to be supported by the
present results obtained and by prior studies. The cultivars used and the intensity of stress applied
have an important influence on the results. This suggests that, if no specific information is available
from the existing literature, daily preliminary studies would be recommended prior to application in
order to select the most appropriate plant water stress indicators
Descrição
Palavras-chave
water management water stress deficit irrigation leaf potential stem diameter transpiration orchards drought tolerance drought avoidance
Contexto Educativo
Citação
Horticulturae 2017, 3, 47
Editora
MDPI