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Estimating cultivar-specific salt tolerance model parameters from multi-annual field tests for identification of salt tolerant potato cultivars

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  • van Straten, G.
  • Bruning, B.
  • de Vos, A.C.
  • González, A. Parra
  • Rozema, J.
  • van Bodegom, P.M.

Abstract

Having salt-tolerant potatoes is of paramount interest to farmers in salt affected areas, but reliable cultivar-specific parameters on salt tolerance are lacking. To address this issue existing field data on tuber yield on sandy soil at six levels of saline irrigation (0.5, 4, 8, 12, 16, 20 dS m−1) of 13 varieties for which data in two or more consecutive years were available, were analysed year-by-year with the method developed earlier. The method provides estimates of the zero-observed-effect yield (Y0), and two typical salt tolerance parameters, - i.e., a characteristic salinity level and a decline parameter –, as well as information about the uncertainties and correlations between these estimates. The results indicate that all varieties have a similar lethal soil salinity (20–24 dS m−1). However, both yield Y0 as well as salt tolerance parameters differ among cultivars, but for a single variety the estimates vary year by year, and have large uncertainties, underlining the difficulty to obtain robust parameters from single year experiments. The annual variety also hampers the discrimination between varieties. To remedy this, the data from multiple years were united in a single analysis by introducing another – unknown, annually varying - factor that is limiting the yield in the trials. Two ways to describe co-current limitations often used in models were tested. In contrast to the minimum rule, the multiplicative rule is found to provide an acceptable description of the observed yields over all years. This results in a single set of salt tolerance parameters with a narrower uncertainty bound than from single year estimation. It shows that with due account of uncertainties, field tests can be used to identify relatively salt tolerant cultivars, while accounting for between-year yield differences. Most potato cultivars have an ECe90 of about 4–5 dS m−1, but for some it is roughly double, while maintaining good yield, suggesting that these varieties are good candidates for salt adapted agriculture.

Suggested Citation

  • van Straten, G. & Bruning, B. & de Vos, A.C. & González, A. Parra & Rozema, J. & van Bodegom, P.M., 2021. "Estimating cultivar-specific salt tolerance model parameters from multi-annual field tests for identification of salt tolerant potato cultivars," Agricultural Water Management, Elsevier, vol. 252(C).
    • Handle: RePEc:eee:agiwat:v:252:y:2021:i:c:s0378377421001670
    DOI: 10.1016/j.agwat.2021.106902
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    References listed on IDEAS

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    1. Homaee, M. & Feddes, R. A. & Dirksen, C., 2002. "Simulation of root water uptake: III. Non-uniform transient combined salinity and water stress," Agricultural Water Management, Elsevier, vol. 57(2), pages 127-144, October.
    2. van Straten, G. & de Vos, A.C. & Rozema, J. & Bruning, B. & van Bodegom, P.M., 2019. "An improved methodology to evaluate crop salt tolerance from field trials," Agricultural Water Management, Elsevier, vol. 213(C), pages 375-387.
    3. Katerji, N. & van Hoorn, J. W. & Hamdy, A. & Mastrorilli, M., 2000. "Salt tolerance classification of crops according to soil salinity and to water stress day index," Agricultural Water Management, Elsevier, vol. 43(1), pages 99-109, February.
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