| Abstract: | The determination of bulk stomata resistance from tensiometric measurements of soil water - represented at the example of field weed societies on high flood loam It was shown that the computation of actual evapotranspiration from water losses above the zero flux layer is reliable enough to determine as well the bulk stomata resistance, used in Monteith's formula, as the shape of the reduction of potential to actual evapotranspiration. For field weed societies the bulk stomata resistance was determined to 37 s/m and, assuming a leaf area index of 3.0, the according plant resistance was calculated to 28 s/m. The reduction function from potential to actual evapotranspiration was linear one, starting at a water content of 70% of the available field capacity and ending at permanent wilking point. Both results are in good agreement with data from literature. |
