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Influence of drip irrigation layout on salt distribution and sap flow in effluent irrigated cotton
Year:
2000
Source of publication :
Acta Horticulturae
Authors :
Cohen, Shabtai
;
.
Meerbach, D.
;
.
Yermiyahu, Uri
;
.
Volume :
537
Co-Authors:
Meerbach, D., Wageningen Agricultural University, Department of Water Resources, Nieuwe Kanaal 11, 6709 PA Wageningen, Netherlands
Dirksen, C., Wageningen Agricultural University, Department of Water Resources, Nieuwe Kanaal 11, 6709 PA Wageningen, Netherlands
Cohen, S., A.R.O. Volcani Center, Institute of Soil, Water and Environ. Sciences, P.O. Box 6, 50250 Bet Dagan, Israel
Yermiyahu, U., A.R.O. Volcani, Center Gilat Experimental Station, Gilat, Israel
Wallach, R., Hebrew University of Jerusalem, Faculty of Agric. Sciences, Rehovot, Israel
Facilitators :
From page:
709
To page:
718
(
Total pages:
10
)
Abstract:
The influence of drip irrigation layout on soil water and salt distributions and associated water stress of cotton irrigated with treated sewage effluent was evaluated by comparing alternate-row irrigation, the standard practice in Israel for cotton, and every-row irrigation. It was expected that every-row irrigation would prevent water stress caused by drying roots, and also salt stress as it occurs under alternate-row irrigation at the edges of the wetted front, by pushing the salts below the root zone. The objective was to quantify the distribution and composition of salts and distribution of water in the root zone and their effect on cotton transpiration for the two treatments. Salt and soil water content were measured with Time Domain Reflectometry. Soil samples to 100 cm depth were analyzed to determine composition and amount of salts, and cotton stem sap flow was measured using the heat pulse method. Results showed higher soil water contents at the alternaterow treatment compared to the every-row treatment and higher soil water contents at 40 cm depth compared to 20 cm depth. The every-row treatment showed higher electrical conductivity at the cotton row compared to the alternate-row treatment, whereas the alternate-row treatment had a higher salinity at 40 cm overall. Analysis of soil samples confirmed larger accumulation of salts at the cotton row for the every-row treatment. Electrical conductivity of the soil water was below the salinity threshold value for cotton. No significant differences in salt composition were observed. Two weeks of continuous stem sap flow measurements of fully grown plants showed no differences in transpiration resulting from the treatments. It is concluded that differences in salinity resulting from the two irrigation treatments are not expected to influence yield and that contrary to the expectation higher salt accumulation occurs in the root zone in case of the every-row treatment as a result of lower water contents in the root zone and thus less percolation.
Note:
Related Files :
COTTON
drip irrigation
Gossypium hirsutum
salinity
Soil water distribution
Waste water reuse
Show More
Related Content
More details
DOI :
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
28598
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:40
Scientific Publication
Influence of drip irrigation layout on salt distribution and sap flow in effluent irrigated cotton
537
Meerbach, D., Wageningen Agricultural University, Department of Water Resources, Nieuwe Kanaal 11, 6709 PA Wageningen, Netherlands
Dirksen, C., Wageningen Agricultural University, Department of Water Resources, Nieuwe Kanaal 11, 6709 PA Wageningen, Netherlands
Cohen, S., A.R.O. Volcani Center, Institute of Soil, Water and Environ. Sciences, P.O. Box 6, 50250 Bet Dagan, Israel
Yermiyahu, U., A.R.O. Volcani, Center Gilat Experimental Station, Gilat, Israel
Wallach, R., Hebrew University of Jerusalem, Faculty of Agric. Sciences, Rehovot, Israel
Influence of drip irrigation layout on salt distribution and sap flow in effluent irrigated cotton
The influence of drip irrigation layout on soil water and salt distributions and associated water stress of cotton irrigated with treated sewage effluent was evaluated by comparing alternate-row irrigation, the standard practice in Israel for cotton, and every-row irrigation. It was expected that every-row irrigation would prevent water stress caused by drying roots, and also salt stress as it occurs under alternate-row irrigation at the edges of the wetted front, by pushing the salts below the root zone. The objective was to quantify the distribution and composition of salts and distribution of water in the root zone and their effect on cotton transpiration for the two treatments. Salt and soil water content were measured with Time Domain Reflectometry. Soil samples to 100 cm depth were analyzed to determine composition and amount of salts, and cotton stem sap flow was measured using the heat pulse method. Results showed higher soil water contents at the alternaterow treatment compared to the every-row treatment and higher soil water contents at 40 cm depth compared to 20 cm depth. The every-row treatment showed higher electrical conductivity at the cotton row compared to the alternate-row treatment, whereas the alternate-row treatment had a higher salinity at 40 cm overall. Analysis of soil samples confirmed larger accumulation of salts at the cotton row for the every-row treatment. Electrical conductivity of the soil water was below the salinity threshold value for cotton. No significant differences in salt composition were observed. Two weeks of continuous stem sap flow measurements of fully grown plants showed no differences in transpiration resulting from the treatments. It is concluded that differences in salinity resulting from the two irrigation treatments are not expected to influence yield and that contrary to the expectation higher salt accumulation occurs in the root zone in case of the every-row treatment as a result of lower water contents in the root zone and thus less percolation.
Scientific Publication
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