Articles

DIURNAL AND SEASONAL VARIATIONS OF CWSI AND NON-WATER-STRESSED BASELINE WITH NECTARINE TREES

Article number
537_49
Pages
415 – 421
Language
English
Abstract
The work described was part of the programme, “Innovative biological indicators to improve the efficiency of water and nitrogen use and the fruit quality in tree crops Project”, a partnership between ISA and INRA. Field studies were conducted in Portugal on different irrigated plots of nectarine trees; a fully irrigated (unstressed plot) and a plot that was not irrigated for some days (stressed plot). The aim of this work was to investigate the effects of plant water stress on canopy temperature, to determine the non-water-stressed baseline and to observe diurnal and seasonal variations of Crop Water Stress Index (CWSI). Canopy temperature, psychrometric and wind speed data were taken each half-hour, between 9:30 and 15:30 h.
Results showed that canopy temperature was higher during the daytime, for both unstressed and stressed plots.
A linear regression of canopy-air temperature differential and the vapor pressure deficit (non-water-stress baseline) showed a r2= 0.65. During the stress period, the average canopy temperature of the stressed plot was up to 5.4oC higher than the unstressed plot.
Diurnal and seasonal average of CWSI values showed differences between unstressed and stressed plots, during the stress period.

Publication
Authors
A. Garcia, R.G.B. André, M.I. Ferreira, T. do Paço
Keywords
Canopy temperature, water stress, Prunus persica, infrared thermometer,cwsi.
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