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קהילה:
אסיף מאגר המחקר החקלאי
פותח על ידי קלירמאש פתרונות בע"מ -
Very low medium moisture tension - A feasible criterion for irrigation control of container-grown plants
Year:
1992
Source of publication :
Acta Horticulturae
Authors :
מדינה, שלומית
;
.
רביב, מיכאל
;
.
שמיר, יואב
;
.
Volume :
342
Co-Authors:

Z. Ben Ner

Facilitators :
From page:
111
To page:
119
(
Total pages:
9
)
Abstract:

Tensiometers, measuring soil water pressure potential (Φp) are in wide use as an aid in determining watering regimes in soil-grown crops. Accuracy of soil tensiometers is low below 5 centibars. Φp in growth media such as tuff and rockwool, rarely exceeds 3 cb. Water availability drops dramatically when

Hp increases from 0 to 3 cb, as a result of a sharp decline in the medium's hydraulic conductivity (Wallach et al., 1992). At present, determination of hydraulic conductivity in situ is not possible. Alternatively, Φp can serve as a good predictor for leaf water potential. Recently a novel tensiometer, sensitive in the milibar range, was developed. When used in conjunction with an adjustable contactor, it enabled the study of plant response to small changes in Φp. Greenhouse rose was chosen as a model crop.

When tension-controlled- was compared with timer-controlled-irrigation, net photosynthesis rates (Pn) were consistently higher during the warmer hours of the day when irrigation intervals were determined according to a preset Φp, provided that its value was low enough. When compared to timer-controlled irrigation, based on Advisory Service recommendations for rose irrigation, the number of watering pulses was higher. When irrigation is controlled by timer alone, as is the case in most commercial operations in Israel, one can expect either periods of Pn, lower than the potential for the prevailing conditions or inefficient water use. Possible effects on yield and water use efficiency will be discussed.

Note:
Related Files :
electronic tensiometer
Leaf temperature
Net photosynthesis
Rosa × hybrida
Rose
soil
water
Water pressure potential
water use
עוד תגיות
תוכן קשור
More details
DOI :
10.17660/ActaHortic.1993.342.13
Article number:
0
Affiliations:
Database:
Publication Type:
מאמר
;
.
מאמר מתוך כינוס
;
.
Language:
אנגלית
Editors' remarks:
ID:
50838
Last updated date:
02/03/2022 17:27
Creation date:
12/10/2020 15:54
You may also be interested in
Scientific Publication
Very low medium moisture tension - A feasible criterion for irrigation control of container-grown plants
342

Z. Ben Ner

Very low medium moisture tension - A feasible criterion for irrigation control of container-grown plants

Tensiometers, measuring soil water pressure potential (Φp) are in wide use as an aid in determining watering regimes in soil-grown crops. Accuracy of soil tensiometers is low below 5 centibars. Φp in growth media such as tuff and rockwool, rarely exceeds 3 cb. Water availability drops dramatically when

Hp increases from 0 to 3 cb, as a result of a sharp decline in the medium's hydraulic conductivity (Wallach et al., 1992). At present, determination of hydraulic conductivity in situ is not possible. Alternatively, Φp can serve as a good predictor for leaf water potential. Recently a novel tensiometer, sensitive in the milibar range, was developed. When used in conjunction with an adjustable contactor, it enabled the study of plant response to small changes in Φp. Greenhouse rose was chosen as a model crop.

When tension-controlled- was compared with timer-controlled-irrigation, net photosynthesis rates (Pn) were consistently higher during the warmer hours of the day when irrigation intervals were determined according to a preset Φp, provided that its value was low enough. When compared to timer-controlled irrigation, based on Advisory Service recommendations for rose irrigation, the number of watering pulses was higher. When irrigation is controlled by timer alone, as is the case in most commercial operations in Israel, one can expect either periods of Pn, lower than the potential for the prevailing conditions or inefficient water use. Possible effects on yield and water use efficiency will be discussed.

Scientific Publication
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