Academic Journal
An improved methodology to evaluate crop salt tolerance from field trials
| العنوان: | An improved methodology to evaluate crop salt tolerance from field trials |
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| المؤلفون: | van Straten, G., de Vos, A. C., Rozema, J., Bruning, B., van Bodegom, P. M. |
| المصدر: | 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 , vol. 213 , pp. 375-387 . https://doi.org/10.1016/j.agwat.2018.09.008 |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Crop salinity tolerance, Parameter estimation, Salinization, /dk/atira/pure/sustainabledevelopmentgoals/climate_action, name=SDG 13 - Climate Action, /dk/atira/pure/sustainabledevelopmentgoals/zero_hunger, name=SDG 2 - Zero Hunger |
| الوصف: | The salt tolerance of crops is commonly expressed in descriptive parameters such as threshold or 50%-yield soil salinity and shape parameters describing the yield curve. Estimation by visual or simplified ordinary least squares (OLS) regression methods has multiple issues: parameter bias due to uncertainty in soil salinity, lack of independent estimates of the reference yield, questionable robustness of the threshold parameter and missing information about uncertainty and correlation of the parameter estimates. Here, we present a comprehensive OLS method together with an analysis of its statistical properties to alleviate and overcome such issues, on the basis of a numerical experiment that mimics observed yield responses to saline groundwater across a range of salinities in the experimental test facility Salt Farm Texel. The results indicate under which experimental conditions bias is not a major problem. The method allows estimation of the zero-observed-effect yield from the data, which is relevant to agricultural practice. Estimates for zero-observed-effect yield and threshold ECe are negatively correlated, underlining the difficulty of obtaining reliable threshold values. The estimated confidence regions are reliable and robust against soil salinity uncertainty, but large observation error jeopardizes the confidence intervals, especially for the slope parameter. Data uncertainty alone can be responsible for substantial differences from experiment to experiment, providing a partial explanation for the wide variety in reported parameters in the literature, and stressing the need for long-term repetitions. Given the lack of robustness of the threshold parameter, we propose to adopt the 90%-yield EC (ECe 90 ) as tolerance parameter. Its confidence bounds can be obtained from a simple reformulation of the original models. We also present uncertainty ellipses as a suitable tool to unite multiple-year estimates. The method is offered as a solid and generic basis for reliable assessment of the cultivation potential ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1016/j.agwat.2018.09.008 |
| الاتاحة: | https://research.vu.nl/en/publications/df676d2a-a640-4c83-9b51-7290ce978772 https://doi.org/10.1016/j.agwat.2018.09.008 https://hdl.handle.net/1871.1/df676d2a-a640-4c83-9b51-7290ce978772 http://www.scopus.com/inward/record.url?scp=85056194597&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=85056194597&partnerID=8YFLogxK |
| Rights: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.486C9BA8 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1016/j.agwat.2018.09.008 |
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