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Increased root zone oxygen by a capillary barrier is beneficial to bell pepper irrigated with brackish water in an arid region
Year:
2014
Source of publication :
Agricultural Water Management
Authors :
Ben-Gal, Alon
;
.
Volume :
131
Co-Authors:
Ityel, E., Wyler Department of Dryland Agriculture, French Associates Institute for Agriculture and Biotechnology of Drylands, Jacob Blaustein Institutes for Desert Research, Sede Boqer Campus 84990, Israel
Ben-Gal, A., Department of Environmental Physics and Irrigation, Agricultural Research Organization, Gilat Research Center, Mobile Post Negev 2, Negev 85280, Israel
Silberbush, M., Wyler Department of Dryland Agriculture, French Associates Institute for Agriculture and Biotechnology of Drylands, Jacob Blaustein Institutes for Desert Research, Sede Boqer Campus 84990, Israel
Lazarovitch, N., Wyler Department of Dryland Agriculture, French Associates Institute for Agriculture and Biotechnology of Drylands, Jacob Blaustein Institutes for Desert Research, Sede Boqer Campus 84990, Israel
Facilitators :
From page:
108
To page:
114
(
Total pages:
7
)
Abstract:
Limitations to growth and biomass production are expected under high (>30. °C) soil temperatures due to low soil oxygen levels and insufficient oxygen transport to roots. These limitations will be exacerbated when irrigation with brackish water dictates large amounts of water application for leaching salts. We hypothesized that the introduction of an artificial capillary barrier (CB), in the form of a gravel layer at the lower root-zone boundary, can increase yields of irrigated horticultural crops due to better soil aeration and improved oxygen supply to roots. The specific objectives of the study were (1) to isolate scenarios where insufficient oxygen concentrations may limit pepper plant growth, (2) to measure oxygen concentrations in media under varied scenarios of CB placement below the active root zone and (3) to understand the environmental factors leading to sub-optimum oxygen concentrations in horticultural soils in a desert environment where supra-optimal soil temperatures are prevalent. At high root-zone temperatures oxygen flux to the roots was lower than the potential uptake rate and therefore soil oxygen concentrations were sub-optimal. These conditions led to reduced plant biomass and fruit yield. Fruit yield was found to decrease by 1% for every soil oxygen concentration decrease of 700. ppm. In a fine textured Reg soil, allowing roots to penetrate into the capillary barrier gravel layer increased oxygen concentration in the root zone by 5% and improved biomass and fruit yield by 16% and 18%, respectively. © 2013 Elsevier B.V.
Note:
Related Files :
arid region
Biomass
Fruits
horticulture
hypoxia
optimization
rhizosphere
Soils
temperature
Show More
Related Content
More details
DOI :
10.1016/j.agwat.2013.09.018
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
21233
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:42
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Scientific Publication
Increased root zone oxygen by a capillary barrier is beneficial to bell pepper irrigated with brackish water in an arid region
131
Ityel, E., Wyler Department of Dryland Agriculture, French Associates Institute for Agriculture and Biotechnology of Drylands, Jacob Blaustein Institutes for Desert Research, Sede Boqer Campus 84990, Israel
Ben-Gal, A., Department of Environmental Physics and Irrigation, Agricultural Research Organization, Gilat Research Center, Mobile Post Negev 2, Negev 85280, Israel
Silberbush, M., Wyler Department of Dryland Agriculture, French Associates Institute for Agriculture and Biotechnology of Drylands, Jacob Blaustein Institutes for Desert Research, Sede Boqer Campus 84990, Israel
Lazarovitch, N., Wyler Department of Dryland Agriculture, French Associates Institute for Agriculture and Biotechnology of Drylands, Jacob Blaustein Institutes for Desert Research, Sede Boqer Campus 84990, Israel
Increased root zone oxygen by a capillary barrier is beneficial to bell pepper irrigated with brackish water in an arid region
Limitations to growth and biomass production are expected under high (>30. °C) soil temperatures due to low soil oxygen levels and insufficient oxygen transport to roots. These limitations will be exacerbated when irrigation with brackish water dictates large amounts of water application for leaching salts. We hypothesized that the introduction of an artificial capillary barrier (CB), in the form of a gravel layer at the lower root-zone boundary, can increase yields of irrigated horticultural crops due to better soil aeration and improved oxygen supply to roots. The specific objectives of the study were (1) to isolate scenarios where insufficient oxygen concentrations may limit pepper plant growth, (2) to measure oxygen concentrations in media under varied scenarios of CB placement below the active root zone and (3) to understand the environmental factors leading to sub-optimum oxygen concentrations in horticultural soils in a desert environment where supra-optimal soil temperatures are prevalent. At high root-zone temperatures oxygen flux to the roots was lower than the potential uptake rate and therefore soil oxygen concentrations were sub-optimal. These conditions led to reduced plant biomass and fruit yield. Fruit yield was found to decrease by 1% for every soil oxygen concentration decrease of 700. ppm. In a fine textured Reg soil, allowing roots to penetrate into the capillary barrier gravel layer increased oxygen concentration in the root zone by 5% and improved biomass and fruit yield by 16% and 18%, respectively. © 2013 Elsevier B.V.
Scientific Publication
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