Fig. 4. Proportions of total P (TP) as PO₄–P, total dissolved P (TDP), and total particulate P (TPP) in runoff water samples collected from 11 sites during the 2-yr experiment (n = 1272). The triangles represent the 1 and 99 percentile of the data and the error bars represent the 5 and 95 percentile of the data. The middle line is the median value of the data range. The upper value of the box is the 75 percentile and the lower value of the box is the 25 percentile.