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The inherent variability of water stress indicators in apple, nectarine and pear orchards, and the validity of a leaf-selection procedure for water potential measurements

Adoption of sustainable irrigation management practices by stone and pome fruit growers in the Goulburn/Murray Valleys, Australia

Irrigation Science : Volume 24, Issue 1, October 2005

Irrigation Science : Volume 23

Irrigation Science : Volume 22

Irrigation Science : Volume 21

Irrigation Science : Volume 20

Irrigation Science : Volume 19

Irrigation Science : Volume 18

Irrigation Science : Volume 17

The inherent variability of water stress indicators in apple, nectarine and pear orchards, and the validity of a leaf-selection procedure for water potential measurements

Content Provider	Springer Nature Link
Author	Naor, Amos Gal, Yoni Peres, Moti
Copyright Year	2005
Abstract	The following two topics were examined: (1) The variability in the measurement of leaf water potential (LWP), stem water potential (SWP), maximum daily trunk shrinkage (MDS), and soil water tension (SWT) in apple, nectarine and pear orchards; and (2) The validity of a leaf-selection procedure for SWP measurements in commercial apple orchards. 27 trees were selected in an apple orchard, 27 in a nectarine orchard, and 30 in a pear orchard. The trees were close to each other. The measurements comprised of: midday SWP in apple, nectarine and pear; midday LWP in apple; MDS in apple and nectarine; and SWT in pear. The mean and standard errors (SEs) of each water status indicator in each species were calculated for an increasing sample size. The sample sizes required for stable averages were: SWP – 4, 5, and 8 trees for apple, nectarine and pear, respectively; MDS – 17 and 16 trees for apple and nectarine, respectively; SWT – 21 for pear trees. The relative SEs (i.e. percent of population mean) were 2.4, 6.1 and 10.1% in SWP/LWP, MDS and SWT, respectively. Possible explanations for the differing variability of the various water status indicators are discussed. The results show that smaller samples were sufficient to represent SWP and LWP properly than what was required for MDS and SWT. 9 commercial apple plots were selected and about 25 randomly selected leaves were used for midday SWP measurements in each plot (i.e. experimental sets). About 5 leaves on closely adjacent “representative” trees were selected in each of the commercial plots (i.e. commercial sets) and midday SWP was measured. The average difference in SWP between the experimental and the commercial sets was –0.127 MPa. The choice of closely adjacent trees increased the deviation from the experimental sets. The use of a reasonable sample size (n=7) may enable midday SWP to be measured within ±0.15 MPa in most commercial orchards.
Starting Page	129
Ending Page	135
Page Count	7
File Format	PDF
ISSN	03427188
Journal	Irrigation Science
Volume Number	24
Issue Number	2
e-ISSN	14321319
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-10-14
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution Forestry Soil Science & Conservation Plant Sciences Agriculture
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science Water Science and Technology

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