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Root-Zone Salinity

I. Selecting a Product–Yield Index and Response Function for Crop Tolerance

^a Semiarid Prairie Agricultural Research Centre, Agriculture and Agri-Food Canada, Box 1030, Swift Current, SK, Canada S9H 3X2
^b Soil Physics/Pesticide Unit, George E. Brown, Jr. Salinity Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Riverside, CA
^c Plant Sciences Group, George E. Brown, Jr. Salinity Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Riverside, CA

View larger version (13K): [in this window] [in a new window]   Fig. 1. Simple linear response function, Yr = a – b(C), applied to the Biggar spring wheat data.

View larger version (13K): [in this window] [in a new window]   Fig. 2. Modified Weibull response function, Yr = exp[a(Cb)], applied to the Biggar spring wheat data.

View larger version (14K): [in this window] [in a new window]   Fig. 3. Bi-exponential response function, Yr = exp[aC – b(C2)], applied to the Biggar spring wheat data.

View larger version (13K): [in this window] [in a new window]   Fig. 4. Modified Gompertz response function, Yr = 1 – exp[a exp(bC)], applied to the Biggar spring wheat data.

View larger version (13K): [in this window] [in a new window]   Fig. 5. Three-piece linear (threshold slope) response function; Yr = 1.0, Yr = 1 – b(C – Ct), Yr = 0.0, applied to the Biggar spring-wheat data.

View larger version (13K): [in this window] [in a new window]   Fig. 6. Modified discount response function, Yr = 1/[1 + (C/C50)exp(sC50)], applied to the Biggar spring wheat data.

View larger version (23K): [in this window] [in a new window]   Fig. 7. Relative crop yield from the modified discount function, Yr = 1/[1+(C/C50)exp(sC50)], with relative root-zone salinity for C50 = 10 dS m–1 and a wide range of values for s.

View larger version (21K): [in this window] [in a new window]   Fig. 8. Change in relative crop yield (Yr) as a function of relative root-zone salinity (C/C50) for four unit changes in parameter (s) using the modified discount function.

View larger version (21K): [in this window] [in a new window]   Fig. 9. Differences in relative crop yield (Yr) derived from the modified discount function with increasing C50–salinity and constant s (s = 0.11) for three sets of changes in root-zone salinity (C) from 1 to 10, 5 to 15, and 10 to 20 dS m–1.