ISHS Acta Horticulturae 278: Symposium on Scheduling of Irrigation for Vegetable Crops under Field Condition
COMPARISON OF GASOMETRIC AND GRAVIMETRIC METHODS OF MEASURING LEAF TRANSPIRATION IN POTTED APRICOT TREES |
| Authors: | R. Gucci, S.A.R. Calì, C. Xiloyannis |
| Abstract:
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. | |
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