Abstract
Sodium uptake and distribution in rice was investigated in various field and screenhouse trials at WARDA’s research station in Ndiaye, Senegal. A conceptual model for sodium uptake and distribution was developed on the basis of the following results: (i) sodium uptake to the plant was transpiration driven; (ii) varieties differed in the way they regulated their stomata in relation to relative humidity and salt stress; (iii) sodium uptake was modulated at the root level by a ‘root filter’; and (iv) sodium was taken out of the transpiration stream and retained in the sheaths with the daily retention capacity as a varietal constant. The model describes the passive uptake of sodium to the plant and its distribution as a function of several varietal constants and transpiration. The root filter function for sodium, the maximum stem sodium retention and the sodium toxicity threshold in the leaves vary among varieties. Varietal differences in stomatal reactions to relative humidity and salt stress were implemented in the ORYZA_W evapotranspiration routine to simulate these reactions. The interactions between sodium and potassium are discussed in relation to available information from literature and preliminary results obtained from screenhouse studies. A concept of potassium distribution in the plant and its interaction with sodium uptake and distribution was included in the model structure.
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Asch, F., Dingkuhn, M., Wopereis, M.C.S., Dörffling, K., Miézan, K. (1997). A conceptual model for sodium uptake and distribution in irrigated rice. In: Kropff, M.J., et al. Applications of Systems Approaches at the Field Level. Systems Approaches for Sustainable Agricultural Development, vol 6. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0754-1_14
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DOI: https://doi.org/10.1007/978-94-017-0754-1_14
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