COMPARISON OF GASOMETRIC AND GRAVIMETRIC METHODS OF MEASURING LEAF TRANSPIRATION IN POTTED APRICOT TREES

R. Gucci, S.A.R. Calì, C. Xiloyannis
Leaf transpiration rates (E) measured with an ADC portable unit were overestimated when compared with E derived from plant weight loss over time. The overestimation was more pronounced for highly transpiring apricot trees (206–287%) than for droughted ones (190–230%) The fitting of regression lines between mean daily E values measured with the two methods on well watered trees could be significantly improved by increasing the number of daily measurements with ADC from 1 to 5, but not for trees under water stress or recovering from it. No correlation between the 2 methods existed when nonhomogeneous data (different time of measurement or daily means compared with single measurements) were compared. Transpiration rates obtained with the ADC portable unit consistently reflected differences of E between treatments.
Gucci, R., Calì, S.A.R. and Xiloyannis, C. (1990). COMPARISON OF GASOMETRIC AND GRAVIMETRIC METHODS OF MEASURING LEAF TRANSPIRATION IN POTTED APRICOT TREES. Acta Hortic. 278, 343-350
DOI: 10.17660/ActaHortic.1990.278.32
https://doi.org/10.17660/ActaHortic.1990.278.32

Acta Horticulturae