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Version 3.18
Publication Type J
Authors Niu, GH; Rodriguez, DS; Starman, T
Author Full Name Niu, Genhua; Rodriguez, Denise S.; Starman, Terri
Title Response of Bedding Plants to Saline Water Irrigation
Language English
Document Type Article
Author Keywords landscape irrigation; salinity tolerance; water reuse
Abstract Bedding plants are extensively used in urban landscapes. As high-quality water supply becomes limited in many parts of the world, the use of recycled water with high salt levels for landscape irrigation is being encouraged. Therefore, information on salt tolerance of bedding plants is of increasing importance. Two experiments were conducted, one in a 25% light exclusion shadehouse in summer (Expt. 1) and the other in a greenhouse in winter (Expt. 2). Plants were irrigated with saline solution at electrical conductivities of 0.8, 2.8, 4.0, 5.1, or 7.4 dS.m(-1) created by adding NaCl, MgSO(4), and CaCl(2) to tap water to simulate the composition of local reclaimed water. In Expt. 1, shoot dry weight (DW) at the end of the experiments was reduced in all species at 7.4 dS.m(-1) compared with the control (0.8 dS.m(-1)). The magnitude of reduction varied with species and cultivars. The salinity thresholds of irrigation water in which growth reduction occurred were 4.0 dS.m(-1) for angelonia (Angelonia angustifalia) cultivars and ornamental pepper (Capsicum autumn) 'Calico' and 4.0 to 5.1 dS.m(-1) for helenium (Helenium amarum), licorice plant (Helichrysum petiolatum), and plumbago (Plumlago auriculata). Shoot DW and growth index of ornamental pepper 'Black Pearl' and vinca (Catharanthus roseus) 'Rose' decreased linearly as salinity increased. All plants survived in Expt. 1 regardless of treatment, except for ornamental pepper 'Purple Flash'. No visual injuries were observed in Expt. 1 regardless of treatment. Leaf sodium (Na) and chlorine (Cl) concentrations varied with species and treatments. Ornamental pepper 'Black Pearl' had the highest leaf Cl concentrations at higher salinities compared with other species and cultivars. Leaf Na concentrations in licorice plant and plumbago were in the range of 10 to 30 g.kg (1) DW, higher than those in other species. In Expt. 2, shoot DW was reduced by salinity treatments in ornamental pepper 'Black Pearl', plumbago, and angelonia but not in other species. The three ornamental peppers, 'Black Pearl', 'Calico', and 'Purple Flash', exhibited slight foliar injuries on some plants in Expt. 2 as a result of high salinity in the root zone in the highest salinity treatment. Ornamental pepper 'Black Pearl' was most sensitive to salinity stress. In general, the bedding plants tested in this study are moderately tolerant to salt stress and may be irrigated with saline water up to 4.0 d.S.m (1) with little reduction in aesthetical appearance.
Author Address [Niu, Genhua; Rodriguez, Denise S.] Texas A&M Univ, Texas AgriLife Res & Extens Ctr, El Paso, TX 79927 USA; [Starman, Terri] Texas A&M Univ, Dept Hort Sci, College Stn, TX 77843 USA
Reprint Address Niu, GH (reprint author), Texas A&M Univ, Texas AgriLife Res & Extens Ctr, 1380 A&M Circle, El Paso, TX 79927 USA.
E-mail Address gniu@ag.tamu.edu
Funding Agency and Grant Number Cooperative State Research, Education and Extension Service, U.S. Department of Agriculture [2005-34461-15661]; El Paso Water Utilities
Funding Text We gratefully acknowledge the financial support from Cooperative State Research, Education and Extension Service, U.S. Department of Agriculture under Agreement No. 2005-34461-15661 and El Paso Water Utilities. We also thank Ball Horticulture for donating seeds.
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Cited Reference Count 23
Times Cited 18
Total Times Cited Count (WoS, BCI, and CSCD) 18
Publisher City ALEXANDRIA
Publisher Address 113 S WEST ST, STE 200, ALEXANDRIA, VA 22314-2851 USA
ISSN 0018-5345
29-Character Source Abbreviation HORTSCIENCE
ISO Source Abbreviation Hortscience
Publication Date APR
Year Published 2010
Volume 45
Issue 4
Beginning Page 628
Ending Page 636
Page Count 9
Web of Science Category Horticulture
Subject Category Agriculture
Document Delivery Number 588DR
Unique Article Identifier WOS:000277048100186
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