Improving potato drought simulations: Assessing water stress factors using a coupled model

摘要: Abstract Effective water management is important for drought sensitive crops like potato ( Solanum tuberosum L.). Crop simulation models are well suited evaluating limited responses in order to provide and phenotypic-trait recommendations more efficient production practice. There considerable variation how stress components implemented with regards simulating soil, plant, atmospheric relationships, thereby influencing the utility of model recommendations. Four water-stress factors were developed SPUDIM assess contribution each factor provided improving modeling accuracy. Iterative comparisons versus experimental data consisting six irrigation treatments used. Factors included F 1, shifts carbon allocation among shoot root organs based on soil moisture availability, 2, coupled response leaf potential expansion, 3, stomatal conductance, 4, increased tuber sink strength. 2 3 accounted up 88% improvement mean square error total biomass. However, 1 4 necessary accurately simulate yield. was also required reproduce trends increasing water-use efficiency harvest index declines availability. When full 4-factor considered, simulated total, leaf, stem, dry weights within 11% observed values. Daily whole plant net photosynthesis evapotranspiration indicated use, but too very low potentials. The calibration coefficients used remained stable over all treatments, suggesting can be utilized evaluate strategies potato.