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Published in Agron J 91:859-862 (1999)
© 1999 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Response of In Situ Leaf Psychrometer to Cuticle Removal by Abrasion

Colin S. Campbella and Kevin J. McInnesa

a Dep. of Soil and Crop Science, Texas A&M University, College Station, TX 77843-2474 USA



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  		Fig. 1 Psychrometer equilibration over 0.05 M (mol kg-1) KCl salt standard solution. Each equilibration is modeled by a first-order equation (Eq. [1]), and fitted at 1-min intervals using nonlinear least squares analysis (solid lines). Equilibration times (teq) for measurements 1, 2, and 3 were 0.9, 2.7, and 10.0 min. The dashed lines represent ±0.05 MPa

 


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  		Fig. 2 Simultaneous equilibration of leaf psychrometers attached to corn. One psychrometer was attached to a surface without abrasion, the other was attached after abrasion with sandpaper. The experimental chamber light was turned on 8 h prior to the test and turned off approximately 4 h into the test. The approximate water potential ({psi}) of the corn leaf during the light period is between -0.5 and -0.6 MPa

 


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  		Fig. 3 Frequency distribution of equilibration times (teq) for four psychrometers equilibrated over 259 different abraded corn and wax leaf ligustrum leaves. The arithmetic mean teq for all four psychrometers is 7.5 min

 




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Journal of Natural Resources
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Environmental Quality		 The Plant Genome
Copyright © 1999 by the American Society of Agronomy.