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| Web URL(s): | https://dl.sciencesocieties.org/publications/cs/pdfs/45/1/0221
Last checked: 03/29/2016
Requires: PDF Reader |
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| Publication Type:
| Refereed |
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| Author(s): | Stephhun, H.;
van Genuchten, M. Th.;
Grieve, C. M. |
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| Author Affiliation: | Stephhun: Semiarid Prairie Agriculture Research Centre, Agriculture and Arig-Food Canada, Swift Current, Saskatchewan, Canada; van Genuchten: Soil Physics/Pesticide Unit, George E. Brown, Jr. Salinity Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Riverside, California; and Grieve: Plant Sciences Group, George E. Brown, Jr. Salinity Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Riverside, California |
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| Title: | Root-zone salinity: II. Indicies for tolerance in agricultural crops |
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| Section: | Crop ecology, management & quality
Other records with the "Crop ecology, management & quality" Section
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| Source: | Crop Science. Vol. 45, No. 1, January/February 2005, p. 221-232. |
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| Publishing Information: | Madison, WI: Crop Science Society of America |
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| # of Pages: | 12 |
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| Keywords: | TIC Keywords: Root zone; Salinity; Salt tolerance; Yield response; Soil salinity; Measurement
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| Abstract/Contents: | "This paper provides the tools for distinguishing levels of tolerance to root-zone salinity in agricultural crops. Such distinction rests on the response of a crop's product yield following the declining, sigmoid-shaped, modified compound-discount function {Yr = 1/[1 + (C/C50 )exp(sC50)]} for plants grown as crops exposed to increasing root-zone salinity. This nonlinear function relates relative yield (Yr) to root-zone salinity (C) measured in equivalent saturated soil-paste extract electrical conductivity with two nonlinear parameters, the salinity level producing 50% of the nonsaline crop yield (C50) and a response curve steepness constant (s) equal to the abosolute value of the mean dYr/dC from Yr = 0.3 to 0.7. These discount parameters suggest the existence of a single-value salinity tolerance index (ST-Index) equal to the 50% reduction in crop yield from that of the nonsaline yield plus a tendency to maintain some product yield as the crop is subjected to salinity levels approaching C50, i.e., ST-Index = C50 + s(C50). The explicit purpose of this study is to determine if the discount fuction using biophysically relevant parameters can be applied to hitorical data sets. Approximations for C50 and S were identified in the threshold salinity (Ct) and declining slope (b) parameters of the well-known threshold-slope linear response function. Several procedures for converting C1 to C50 and b to s offer the linkage between these linear and nonlinear response functions. From these procedures, two regression equations, C50 = 0.988[0.5/b) + Ct] - 0.252 and s = 1.52b, proved the most appropriate for the eight representative field, forage, and vegetable crops tested. The selected conversion procedures were applied to previously published Ct and b values to obtain a list of the relative root-zone salinity tolerance in agriculture crops. In addition to C50 and s, values for exp(sC50) and the ST-Index were computed for each crop. The revised list provides extension personnel and plant growth modelers the parameter values from a nonlinear analog of crop yield response to root-zone salinity." |
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| Language: | English |
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| References: | 140 |
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| See Also: | Other items relating to: Soil Salinity |
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| Note: | Figures
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
van Genuchten, M. Th., H. Stephhun, and C. M. Grieve. 2005. Root-zone salinity: II. Indicies for tolerance in agricultural crops. Crop Sci. 45(1):p. 221-232. |
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| Web URL(s):
https://dl.sciencesocieties.org/publications/cs/pdfs/45/1/0221
Last checked: 03/29/2016
Requires: PDF Reader |
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MSU catalog number: SB 183 .C7 |
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