Most P desorption was rapid, occurring within
the first 30 minutes of contact between soil and solution.
Reactive P concentrations in solution increased
as the salt concentration decreased from 0.01 M CaCl2 to RO
water (Figure 2-A), confirming that solution chemistry determines P desorption.
The solution:soil ratio further affects RP
desorption to solution, because concentrations decreased as the solution:soil
ratio increased from 200:1 to 2000:1 (Figure 2-B).
Strong correlations existed between RP concentrations
and various soil P tests. The strongest correlations were with 0.01
M CaCl2 solution for all soil P tests (Table 2).
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