Five different methods for measuring transpiration, which include gravimetrie analysis (control), heat pulse velocity (HPY), time domain reflectometry (TDR), single leaf and whole plant infrared gas-exchange measurements, have been tested on two cultivars (Redcort and Empire) ofyoung appIe trees (Malus communis L.). The objective was to compare these methods and establish the most affordable one to be used in greenhouse conditions in order to determine and/or estimate the amount of water far an efficient irrigation management. Results obtained with TDR were particularly accurate and nol statistically different with respect to the control (-4.2 %) and this was supported by the correlation coefficient (r = 0.94) found. The HPY method was sufficiently accurate and reliable for small stems, however, in our conditions this method generally underestimated the transpiration (-32.4 %). Single leaf and particularly whole plant infrared gas-exehange measurements suffered an overestimation ofthe transpiration with respect to the control.
Comparison between different methods for measuring transpiration in potted apple trees
Ferrara, G.;
2003-01-01
Abstract
Five different methods for measuring transpiration, which include gravimetrie analysis (control), heat pulse velocity (HPY), time domain reflectometry (TDR), single leaf and whole plant infrared gas-exchange measurements, have been tested on two cultivars (Redcort and Empire) ofyoung appIe trees (Malus communis L.). The objective was to compare these methods and establish the most affordable one to be used in greenhouse conditions in order to determine and/or estimate the amount of water far an efficient irrigation management. Results obtained with TDR were particularly accurate and nol statistically different with respect to the control (-4.2 %) and this was supported by the correlation coefficient (r = 0.94) found. The HPY method was sufficiently accurate and reliable for small stems, however, in our conditions this method generally underestimated the transpiration (-32.4 %). Single leaf and particularly whole plant infrared gas-exehange measurements suffered an overestimation ofthe transpiration with respect to the control.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
