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Mathias Neumann Andersen

SVAT modeling of crop physiological response to drought in potatoes under different types of deficit irrigation

Research output: Contribution to conferenceConference abstract for conferenceResearch

  • Department of Agroecology and Environment
  • Soil physics and Soil resources
  • Climate and Bioenergy
 

Further understanding of the crop physiologic responses to drought caused by deficit irrigation (DI), regular or partial root drying (PRD), have been obtained in several studies in tomatoes and potatoes under controlled environment. The improved quantitative description of the production of abscisic acid in the root system and as well as its influence on stomatal regulation of gas exhange has been implemented in the Daisy model, a comprehensive work partly financed by the SAFIR project (http://www.safir4eu.org/). Hence, the improved Daisy model now calculates crop production based on gas exchange (CO2 and H2O) from the canopy configured as a big leaf with sun and shade compartments where the gas exchange in its basics is described according to the theory of Farquhar and Ball-Berry, but further modified to include effects of ABA signaling. The Daisy model has as well been further developed to include 2D root development, water and nitrogen uptake to enable studies of the effect of PRD/DI on improving water-use- efficiency. The present paper presents the new processes implemented in Daisy, and a comprehensive test of the model against data obtained under field conditions. Preliminary results show some discrepancies between modeled and measured ABA production, probably due to the fact that the latter was obtained from pot experiments. Further, the modeling work show a reasonable fit to measured 2D soil water content, but further refinement of the model is needed to explain water flow in a potato ridge system, which in fact is a 3D structure.

Original languageEnglish
Publication year2009
Number of pages1
Publication statusPublished - 2009
Event3rd International Conference on Integrated Approaches to Improve Crop Production Under Drought Prone Environments (InterDrought-III) - Shanghai, China
Duration: 12 Oct 200916 Oct 2009

Conference

Conference3rd International Conference on Integrated Approaches to Improve Crop Production Under Drought Prone Environments (InterDrought-III)
CountryChina
CityShanghai
Period12/10/200916/10/2009

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