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Measuring Agronomic and Environmental Soil Phosphorus Saturation and Predicting Phosphorus Leaching with Mehlich 3

Dep. Plant and Soil Sci., Univ. of Delaware, Newark, DE 19717-1303

View larger version (29K): [in a new window]   Fig. 1. Comparison of Mehlich 3 extractable Al and Fe to oxalate extractable Al and Fe.

View larger version (17K): [in a new window]   Fig. 2. Relationship between the Mehlich 3 P saturation ratio I, calculated as the molar ratio P/[Al + Fe], and the Mehlich 3 P saturation ratio II, calculated as the molar ratio P/Al.

View larger version (24K): [in a new window]   Fig. 3. Relationship between the oxalate degree of P saturation, calculated on a molar basis as DPSox = (P/0.5[Al + Fe]) x 100% and (a) the Mehlich 3 P saturation ratio I, calculated as the molar ratio P/[Al + Fe] and (b) the Mehlich 3 P saturation ratio II, calculated as the molar ratio P/Al. Conversion of the oxalate environmental limit, suggested in the Netherlands, of 25% into both Mehlich 3 P saturation ratios is shown.

View larger version (31K): [in a new window]   Fig. 4. Relationship between the concentration of P in leachate water and (a) the oxalate degree of P saturation, calculated as DPSox = (P/0.5[Al + Fe]) x 100%, where P, Al and Fe are in mmol kg-1 (including the environmental limit suggested in the Netherlands) and (b) the Mehlich 3 P saturation ratio I (reproduced from Maguire and Sims, 2002), calculated as the molar ratio P/[Al + Fe] (including the equivalent environmental limit suggested in the Netherlands from Fig. 3a and the highest and lowest agronomic optimum Mehlich 3 P saturation ratios, which were for the Evesboro and Pocomoke series respectively. The equations for the lines above and below the change point exclude the two outliers).