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Comparison of Campbell-leaf press with standard plant water stress measurements for four species

Sojka, R.E. and Sadler, E.J. and Camp, C.R. and Arnold, F.B. (1987) Comparison of Campbell-leaf press with standard plant water stress measurements for four species. pp. 39-45. In: Proc. of Int. Conf. on Meas. of Soil & Plant Water Status, Vol. 2. 1987.

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Abstract

The Campbell-Brewster (J-14) leaf press is a compact alternative to the pressure chamber for plant water potential determination. Data comparing the J-14 with the pressure chamber (?x) or with canopy temperatures (Tc) and crop water stress index (CWSI) are limited. All three J-14 end points (exudation from cut or uncut leaf edges or darkening of interveinal areas) were highly correlated among themselves for the four species studied. Correlations of J-14 end points with other stress indicators from unstable diurnal periods were poor. Our data shoved a species-related reliability of the J-14. The J-14 produced r2 values above 0.7 for soybean for all but comparisons with CWSI or Tc minus air temperature (?T), and for corn for ?x only. The J-14 did not perform well for tomato or rapeseed. Failure of J-14 or ?x, to correlate well with CWSI suggests difficulty with CWSI measurement under humid southeastern conditions.

Item Type: Conference or Workshop Item (Paper)
NWISRL Publication Number: 0635
Subjects: Research methodology
Mass Import - autoclassified (may be erroneous)
Depositing User: Dan Stieneke
Date Deposited: 20 Nov 2010 21:57
Last Modified: 10 Jan 2017 23:01
Item ID: 1045
URI: https://eprints.nwisrl.ars.usda.gov/id/eprint/1045

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