Results 261 to 270 of about 1,099,280 (306)

Relations between water content, potential and permeability in stems of conifers.

Plant, Cell and Environment, 1982
Abstract. The influence of sapwood water content on the conductivity of sapwood to water was measured on stem sections of Pinus contorta. A reduction in relative water content from 100 to 90% caused permeability to fall to about 10% of the saturated value.
W. R. N. EDWARDS, P. G. JARVIS
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A new method of measuring water potential in tree stems by water injection

Plant, Cell and Environment, 1981
Abstract. A new method of measuring xylem water potential in the stems of trees is described. The flow rate of water injected into the xylem at two or more known pressures is measured. The xylem water potential is derived either graphically from the relationship between flow rate and applied pressure, or from the solution of simultaneous flow equations.
W. R. N. EDWARDS, P. G. JARVIS
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The Relationship between Stem Diameter and Water Potentials in Stems of Young Cabbage Plants

Journal of Experimental Botany, 1984
Continuous measurements were made of stem shrinkage, stem water potential (fj and transpiration rate (T) in young, pot-grown cabbage plants subjected to cycling evaporative demands. Sequences of increasing evaporative demands induced increases in T and decreases in both Ws and stem diameter and conversely, whenever evaporative demand decreased, T ...
T. MCBURNEY, P. A. COSTIGAN
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Simultaneous measurements of tomato fruit and stem water potentials using in situ stem hygrometers

Canadian Journal of Botany, 1989
Simultaneous measurements were made of the water potentials of the stem and fruit of intact tomato plants (Lycopersicon esculentum Mill. var. Heinz 2653) using in situ temperature-corrected stem psychrometers. Water potential of the fruit remained consistently lower than the water potential of the stem except when the plant had been subjected to ...
D. R. Lee, M. A. Dixon, R. W. Johnson
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WATER RELATIONS IN HAZELNUT: SAP FLOW, PREDAWN WATER POTENTIAL AND MICROMORPHOMETRIC VARIATIONS OF STEM DIAMETER

Acta Horticulturae, 1994
International ...
Ameglio, Thierry, Mingeau, M., Archer, Philippe, Pons, B.   +3 more
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Determining mid-day stem water potential from sap flow measurements

Acta Horticulturae, 2018
Trees tend to stabilize mid-day sap velocity through apparently coordinated active canopy conductance (Gc) responses to atmospheric evaporative demand. We recently reported a model describing this stabilization based on the linear relationship between canopy resistance (Rc) and vapor pressure deficit (VPD).
O. Ahiman, A. Naor, S. Friedman, S. Cohen   +3 more
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Radial Propagation of Water Potential in Stems¹

Agronomy Journal, 1972
AbstractContraction and expansion of a cotton (Gossypium hirsutum L.) stem in response to a diurnal cycle of leaf water potential is described mathematically using a passive diffusion analysis. The domain of the problem is the stem phloem and associated tissues that are bounded on the outside by impervious bark and on the inside by the xylem that is ...
Fred J. Molz, Betty Klepper
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Deficit irrigation strategies using midday stem water potential in prune

Irrigation Science, 2001
The effects of two levels of water stress on fruit yield, quality and relative economic return were investigated in French prune over a 3-year period. Water stress was achieved by allowing a progressive decrease in midday stem water potential (midday Ψstem) over the season.
Bruce D. Lampinen, Kenneth A. Shackel, Stephen M. Southwick, William H. Olson   +3 more
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Midday Stem Water Potential as a Basis for Irrigation Scheduling

5th National Decennial Irrigation Conference Proceedings, 5-8 December 2010, Phoenix Convention Center, Phoenix, Arizona USA, 2010
There has been great progress in using midday stem water potential (SWP, measured with the pressure chamber) as a basis for irrigation scheduling, particularly for the management of regulated deficit irrigation (RDI) in trees and vines. In almonds, RDI is used during a one month period when the hulls are splitting, in order to reduce hull rot and ...
null K A Shackel, null R P Buchner, null J H Connell, null J P Edstrom, null A E Fulton, null B A Holtz, null B D Lampinen, null R O Reil, null William L Stewart, null M A Viveros   +9 more
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Wheat Maintains Stem Water Potential During Drought Stress Despite Declining Osmotic Potential

Physiologia Plantarum
ABSTRACT Plant water potential is one of the most frequently measured variables of plant water status. Stem water potential, often approximated by wrapping the leaves, is assumed to be more stable and a better measure of drought stress than leaf water potential. In wheat (
Sarah Verbeke, Carmen María Padilla‐Díaz, Sarah Lievens, Helena Faveere, Stan Goethals, Zoë Vandekerckhove, Kim Vandewoestijne, Kathy Steppe   +7 more
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