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 (Ψx) 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 (ΔT), and for corn for Ψx
only. The J-14 did not perform well for tomato or
rapeseed. Failure of J-14 or Ψx, 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