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Physiological responses of leaves, tree growth and fruit yield of grapefruit trees under reflective shade screens
Year:
2005
Source of publication :
Scientia Horticulturae
Authors :
Cohen, Shabtai
;
.
Grava, Avraham
;
.
Li, Yan
;
.
Raveh, Eran
;
.
Volume :
107
Co-Authors:
Cohen, S., Department of Environmental Physics and Irrigation, Institute of Soil, Water and Environmental Sciences, A.R.O. Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Raveh, E., Institute of Horticulture, A.R.O. Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Li, Y., Department of Environmental Physics and Irrigation, Institute of Soil, Water and Environmental Sciences, A.R.O. Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Grava, A., Department of Environmental Physics and Irrigation, Institute of Soil, Water and Environmental Sciences, A.R.O. Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Goldschmidt, E.E., Institute of Plant Sciences and Genetics in Agriculture, Hebrew University of Jerusalem, Rehovot 76100, Israel
Facilitators :
From page:
25
To page:
35
(
Total pages:
11
)
Abstract:
Understanding the influence of reductions in solar radiation on crop physiology, growth and yield is important because of the widespread practice of protected cultivation under various light reducing covers. Parts of a commercial bearing grapefruit orchard (Citrus paradisi L.) were covered with aluminized reflective screens during three consecutive summers in southern Israel. Screens were installed shortly after fruit set and removed a week or 2 before harvest. Screens were of two types, 30 and 60% shade, erected horizontally over the rows. Shading reduced mid-day direct radiation reaching the trees and reduced exposed leaf temperatures, but increased their net CO2 uptake (A) and conductance (gl). The increased gl was reflected by decreases in carbon isotope ratios (δ13C) of leaves from under both shades and of fruit flavedo from the 60% shade. Final leaf area index (LAI), determined by gap fraction inversion, was 10% higher in 30% shade than in the control and canopy volume increased similarly. Trunk cross-section, total yield and size distribution of fruit were little affected by shade. During the second year, however, early shading presumably induced more than normal fruit abscission, leading to fewer but larger fruit. Fruit in the middle of the canopy of shaded trees were consistently heavier and also larger in the first 2 years, but peel width was not affected by shade. Juice content was reduced in the second and third years, but the ratio of sugar to acid was not affected. Mid-day leaf water potentials in August and September under 60% shade increased by 13%. Shading did not significantly reduce fruit yield. © 2005 Elsevier B.V. All rights reserved.
Note:
Related Files :
Citrus paradisi
Citrus x paradisi
Leaf conductance
photosynthesis
physiological response
Water relations
δ13C
Show More
Related Content
More details
DOI :
10.1016/j.scienta.2005.06.004
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
31433
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 01:02
Scientific Publication
Physiological responses of leaves, tree growth and fruit yield of grapefruit trees under reflective shade screens
107
Cohen, S., Department of Environmental Physics and Irrigation, Institute of Soil, Water and Environmental Sciences, A.R.O. Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Raveh, E., Institute of Horticulture, A.R.O. Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Li, Y., Department of Environmental Physics and Irrigation, Institute of Soil, Water and Environmental Sciences, A.R.O. Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Grava, A., Department of Environmental Physics and Irrigation, Institute of Soil, Water and Environmental Sciences, A.R.O. Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Goldschmidt, E.E., Institute of Plant Sciences and Genetics in Agriculture, Hebrew University of Jerusalem, Rehovot 76100, Israel
Physiological responses of leaves, tree growth and fruit yield of grapefruit trees under reflective shade screens
Understanding the influence of reductions in solar radiation on crop physiology, growth and yield is important because of the widespread practice of protected cultivation under various light reducing covers. Parts of a commercial bearing grapefruit orchard (Citrus paradisi L.) were covered with aluminized reflective screens during three consecutive summers in southern Israel. Screens were installed shortly after fruit set and removed a week or 2 before harvest. Screens were of two types, 30 and 60% shade, erected horizontally over the rows. Shading reduced mid-day direct radiation reaching the trees and reduced exposed leaf temperatures, but increased their net CO2 uptake (A) and conductance (gl). The increased gl was reflected by decreases in carbon isotope ratios (δ13C) of leaves from under both shades and of fruit flavedo from the 60% shade. Final leaf area index (LAI), determined by gap fraction inversion, was 10% higher in 30% shade than in the control and canopy volume increased similarly. Trunk cross-section, total yield and size distribution of fruit were little affected by shade. During the second year, however, early shading presumably induced more than normal fruit abscission, leading to fewer but larger fruit. Fruit in the middle of the canopy of shaded trees were consistently heavier and also larger in the first 2 years, but peel width was not affected by shade. Juice content was reduced in the second and third years, but the ratio of sugar to acid was not affected. Mid-day leaf water potentials in August and September under 60% shade increased by 13%. Shading did not significantly reduce fruit yield. © 2005 Elsevier B.V. All rights reserved.
Scientific Publication
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