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Validation of a root water uptake model to estimate transpiration constraints

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  • Casaroli, Derblai
  • de Jong van Lier, Quirijn
  • Dourado Neto, Durval

Abstract

Experimental results obtained from a greenhouse trial with common bean (Phaseolus vulgaris L.) plants performed to test model hypotheses regarding the onset of limiting hydraulic conditions and the shape of the transpiration reduction curve in the falling rate phase are presented. According to these hypotheses based on simulations with an upscaled single-root model, the matric flux potential at the onset of limiting hydraulic conditions is as a function of root length density and potential transpiration rate, while the relative transpiration in the falling rate phase equals the relative matric flux potential. Transpiration of bean plants in water stressed pots with four different soils was determined daily by weighing and compared to values obtained from non-stressed pots. This procedure allowed determining the onset of the falling rate phase and corresponding soil hydraulic conditions. At the onset of the falling rate phase, the value of matric flux potential Ml showed to differ in order of magnitude from the model predicted value for three out of four soils. This difference between model and experiment can be explained by the heterogeneity of the root distribution which is not considered by the model. An empirical factor to deal with this heterogeneity should be included in the model to improve predictions. Comparing the predictions of relative transpiration in the falling rate phase using a linear shape with water content, pressure head or matric flux potential, the matric flux potential based reduction function, in agreement with the hypothesis, showed the best performance, while the pressure head based equation resulted in the highest deviations between observed and predicted values of relative transpiration rates.

Suggested Citation

  • Casaroli, Derblai & de Jong van Lier, Quirijn & Dourado Neto, Durval, 2010. "Validation of a root water uptake model to estimate transpiration constraints," Agricultural Water Management, Elsevier, vol. 97(9), pages 1382-1388, September.
    • Handle: RePEc:eee:agiwat:v:97:y:2010:i:9:p:1382-1388
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    References listed on IDEAS

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    1. Green, Steve R. & Kirkham, M.B. & Clothier, Brent E., 2006. "Root uptake and transpiration: From measurements and models to sustainable irrigation," Agricultural Water Management, Elsevier, vol. 86(1-2), pages 165-176, November.
    2. Novak, V. & Hurtalova, T. & Matejka, F., 2005. "Predicting the effects of soil water content and soil water potential on transpiration of maize," Agricultural Water Management, Elsevier, vol. 76(3), pages 211-223, August.
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    1. Liao, Renkuan & Yang, Peiling & Zhu, Yuanhao & Wu, Wenyong & Ren, Shumei, 2018. "Modeling soil water flow and quantification of root water extraction from different soil layers under multi-chemicals application in dry land field," Agricultural Water Management, Elsevier, vol. 203(C), pages 75-86.

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