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Agronomic Effectiveness of Calcium Phosphate Recovered from Liquid Swine Manure

USDA-ARS, Coastal Plains Soil, Water, and Plant Research Center, 2611 W. Lucas St., Florence, SC 29501-1242

View larger version (136K): [in this window] [in a new window]   Fig. 1. (a) Recovered calcium phosphate precipitate from full-scale wastewater treatment plant. (b) Selected particle sizes after grinding and sieving the recovered phosphate material.

View larger version (17K): [in this window] [in a new window]   Fig. 2. Phosphorus concentration of ryegrass plant tissues as affected by fertilizer material and application rate. Data are the average of two trials of the experiment. Standard error bars are shown when their size was larger than that of the symbol.

View larger version (19K): [in this window] [in a new window]   Fig. 3. Phosphorus uptake by ryegrass as affected by fertilizer material and application rate. Data are the average of two runs of the experiment. Standard error bars are shown when their size was larger than the symbol.

View larger version (18K): [in this window] [in a new window]   Fig. 4. Mehlich-3 extractable phosphorus concentration remaining in the soil after 7 wk of ryegrass growth as affected by fertilizer material and application rate. Data are the average of two runs of the experiment. Standard error bars are shown when their size was larger than the symbol.