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Leaf-Cutter Psychrometers

A Cautionary Note

^a CSIRO Plant Industry, Private Bag No. 5, Wembley (Perth), W.A. 6913, Australia
^b Dep. of Pomology, Univ. of California, Davis, CA 95616-8683 USA

View larger version (35K): [in a new window]   Fig. 1 Relationship between leaf measured with the pressure chamber (P) and that measured with the leaf-cutter psychrometer (L) when the sample was obtained with (A) the cutter of the psychrometer (L = 0.45P3 + 0.75P2 + 0.67P - 0.34; r2 = 0.68); (B) a new pair of razor blades (L = 1.02P + 0.11; r2 = 0.84); (C) a disposable biopsy punch (L = 1.19P + 0.23; r2 = 0.92); and (D) a biopsy punch, where the leaf was subsequently damaged with a nail punch (L = 0.23P3 - 0.50P2 - 0.89P - 0.54; r2 = 0.90). Values in (C) were the undamaged controls for (D); additional sets of data for undamaged discs obtained with the biopsy punch gave similar results to (C). Values are means ± 1 SE of 2 (C and D) or 3 (A and B) separate samples. The dotted line is the 1:1 line