Abstract
A non-destructive electric resistance method was devised and used to measure diurnal changes in flesh moisture of attached fruits of ‘Bartlett’ pear trees. Quantitative levels of flesh moisture could be converted, with approximately linear calibrations, into electric resistances, as measured by a Wheatstone's bridge with a high-frequency current to prevent polarization of the flesh between the 2 iron needles (sensors). A variable condenser eliminated the effect of the electrical capacity of the flesh on balancing the bridge. Flesh temperatures were measured simultaneously with thermocouples. The interruptions from changes in temperature were eliminated by using temperature curves of flesh electrical resistances. Large differences in the electrical resistances of the flesh were seen between irrigated and water-stressed (not irrigated) trees of ‘Bartlett’.
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