Fig. 5. Simulated zinc balance for the regional scale. The boxes give the interquartile range (IQR). The horizontal bar in each box indicates the median. The length of the whiskers is 1.5 x IQR, values outside these limits are plotted as points. I_Man = inputs by animal manure; I_Se, I_CF, and I_Pes = inputs with sewage sludge, commercial fertilizer, and pesticides, respectively; I_Atm = atmospheric deposition; O_Crop = output by crop removal; O_L = leaching; and x_med = median flux.

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