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Fig. 6. Principal response curve diagram resulting from the analysis of the litter data set indicating the effect the sludge application on the litter chemical composition. Of all variance, 77.8% could be attributed to the sampling date displayed on the horizontal axis. Only 10.6% of all variance could be attributed to treatment; 84.7% of this variance is displayed on the vertical axis. The lines represent the course of the treatment levels in time. The component weight can be interpreted as the affinity of this component with the principal response curves. Monte Carlo test, *: p 
0.05, **: p 0.01.
