Within this article an incorrect figure was included. The correct figure is shown below.

Fig. 7. Leaf potassium concentrations for different K treatments in the Aplahoué-2004 (a) and Savalou-2005 (b) experiments. K was applied to the soil at 130°Cd post-emergence. K was determined for whole plant leaves and expressed on a dry weight basis. Vertical bars are confidence intervals at P<0.05.