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Fig. 1 Time course of P desorption to mixed cation and anion exchange resins (ACER), plotted as the ratio between the amount of P desorbed (q) and the maximum amount of desorbable P (qmax) against lnt for (a) the limed acid and (b) the calcareous soils. The qmax value was calculated by fitting the Johnson–Mehl equation to the data
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