Root-zone salinity. II. Indices for tolerance in agricultural crops

Maas, 1990). Averaged spatially and temporally, the salinity (C) of the subsurface interstitial solutions can This paper provides the tools for distinguishing levels of tolerance 50% of the nonsaline crop yield (C50) and a response curve steepness the six functions tested. Equation (2) describes a func- constant (s) equal to the absolute value of the mean dYr/dC from Yr 0.3 to 0.7. These discount parameters suggest the existence of tion with two biophysically based parameters: C50, the a single-value salinity tolerance index (ST-Index) equal to the 50% salinity (C )a tYr 0.5, and s (a steepness parameter) reduction incrop yieldfrom thatof thenonsaline yieldplus atendency identified as an approximate estimate of the absolute to maintain some product yield as the crop is subjected to salinity value of the mean dYr/dC for the equation from Yr levels approaching C50, i.e., ST-Index C50 s(C50). The explicit 0.3 to 0.7. purpose of this study is to determine if the discount function using If the term p is substituted for (exp(sC50)) in Eq. (2), biophysically relevant parameters can be applied to historical data a form of the modified discount function results, which sets. Approximations for C50 and s were identified in the threshold was introduced by van Genuchten (1983) and van Gen- salinity (Ct) and declining slope (b) parameters of the well-known

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