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Minimal water discharge growing system: Characteristics at a steady-state situation
Year:
1997
Source of publication :
Acta Horticulturae
Authors :
Krasnovsky, Arkady
;
.
Medina, Shlomit
;
.
Raviv, Michael
;
.
Volume :
450
Co-Authors:
Raviv, M., Dept. of Ornamental Horticulture, Agricultural Research Organization, Newe ya'Ar Research Center, P.O.B. 1021, Ramat Yishay 30095, Israel
Krasnovsky, A., Dept. of Ornamental Horticulture, Agricultural Research Organization, Newe ya'Ar Research Center, P.O.B. 1021, Ramat Yishay 30095, Israel
Medina, Sh., Dept. of Ornamental Horticulture, Agricultural Research Organization, Newe ya'Ar Research Center, P.O.B. 1021, Ramat Yishay 30095, Israel
Facilitators :
From page:
133
To page:
138
(
Total pages:
6
)
Abstract:
Water shortage and high salinity are the major limiting factors for agricultural productivity in Israel. Water salinity, on the other hand, dictates high (ca. 40%) leaching factor (LF) in intensive, soilless run-to-waste systems. Due to the luxury feeding practiced in these systems, the discharged water is a major source of nitrates (and pesticides) that, when reaching groundwater are causing a further deterioration of their quality. Recycling greenhouse effluents may be, therefore, beneficial from both environmental and economical aspects. Two main problems may hinder drainage water (DW) recirculation: a. The risk of a rapid spread of potentially pathogenic soil-borne pathogens; b. The damage inflicted by accumulated salts that are present in the tap water when their concentration in the system exceed certain level. The present paper addresses the second problem as experience shows that for cut roses the first one is nor severe. Rose plants (cv. "Mercedes" ) were planted in tuff medium at April 1993. Recirculation started at December 1993. During the first 20 months the tuff acted as an ion exchanger, releasing nutritional ions such as calcium and magnesium (which were not supplied with the fertigation solution) and adsorbed sodium. During all this period water were rarely discharged without any effect on yield quantity or quality. When steady state was achieved, water were discharged whenever the EC of the DW exceeded predetermined values (3.0 for the non-recirculated control, 3.5, 4.0, and 4.5 ds m-1 for three recirculation treatments). At these regimes discharge rates were 38%, 23%, 10% and 8%, respectively, again with no negative effect on yield. Periodical plating of samples derived from DW, roots and tuff on selective media, revealed no indication for the development of any soil- borne disease. The potential water savings as well as the degree of pollution prevention will be described and discussed.
Note:
Related Files :
Drainage water recirculation
Rosa x hybrida
salinity
soilless culture
Tuff
Show More
Related Content
More details
DOI :
Article number:
Affiliations:
Database:
Scopus
Publication Type:
Conference paper
;
.
Language:
English
Editors' remarks:
ID:
30884
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:58
Scientific Publication
Minimal water discharge growing system: Characteristics at a steady-state situation
450
Raviv, M., Dept. of Ornamental Horticulture, Agricultural Research Organization, Newe ya'Ar Research Center, P.O.B. 1021, Ramat Yishay 30095, Israel
Krasnovsky, A., Dept. of Ornamental Horticulture, Agricultural Research Organization, Newe ya'Ar Research Center, P.O.B. 1021, Ramat Yishay 30095, Israel
Medina, Sh., Dept. of Ornamental Horticulture, Agricultural Research Organization, Newe ya'Ar Research Center, P.O.B. 1021, Ramat Yishay 30095, Israel
Minimal water discharge growing system: Characteristics at a steady-state situation
Water shortage and high salinity are the major limiting factors for agricultural productivity in Israel. Water salinity, on the other hand, dictates high (ca. 40%) leaching factor (LF) in intensive, soilless run-to-waste systems. Due to the luxury feeding practiced in these systems, the discharged water is a major source of nitrates (and pesticides) that, when reaching groundwater are causing a further deterioration of their quality. Recycling greenhouse effluents may be, therefore, beneficial from both environmental and economical aspects. Two main problems may hinder drainage water (DW) recirculation: a. The risk of a rapid spread of potentially pathogenic soil-borne pathogens; b. The damage inflicted by accumulated salts that are present in the tap water when their concentration in the system exceed certain level. The present paper addresses the second problem as experience shows that for cut roses the first one is nor severe. Rose plants (cv. "Mercedes" ) were planted in tuff medium at April 1993. Recirculation started at December 1993. During the first 20 months the tuff acted as an ion exchanger, releasing nutritional ions such as calcium and magnesium (which were not supplied with the fertigation solution) and adsorbed sodium. During all this period water were rarely discharged without any effect on yield quantity or quality. When steady state was achieved, water were discharged whenever the EC of the DW exceeded predetermined values (3.0 for the non-recirculated control, 3.5, 4.0, and 4.5 ds m-1 for three recirculation treatments). At these regimes discharge rates were 38%, 23%, 10% and 8%, respectively, again with no negative effect on yield. Periodical plating of samples derived from DW, roots and tuff on selective media, revealed no indication for the development of any soil- borne disease. The potential water savings as well as the degree of pollution prevention will be described and discussed.
Scientific Publication
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