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The Effect of Long-Term Annual Application of Biosolids on Soil Properties, Phosphorus, and Metals

^a Dep. of Plant and Soil Sciences, Oklahoma State Univ., Stillwater, OK 74078
^b Institute of Soil Science, Nanjing, China
^c School of Environment and Natural Resources, The Ohio State Univ., Columbus, OH 43210
^d Dep. of Statistics, Oklahoma State Univ., Stillwater, OK 74078
^e STV Incorporated, 80 Ferry Blvd., Stratford, CT 06615

View larger version (11K): [in this window] [in a new window]   Fig. 1. The relationships between (A) DTPA extractable Cu and total biosolids applied, (B) DTPA extractable Zn and total biosolids applied, and DTPA extractable Fe and total biosolids applied for the Norge soil (fine-silty, mixed, active, thermic Udic Paleustoll). ***p < 0.001.

View larger version (10K): [in this window] [in a new window]   Fig. 2. The relationships between (A) Mehlich 3 P and P added and (B) water soluble P and P added from biosolids for the Norge soil (fine-silty, mixed, active, thermic Udic Paleustoll). ***p < 0.001.

View larger version (8K): [in this window] [in a new window]   Fig. 3. The relationship between water soluble P and Mehlich3 P for the Norge soil (fine-silty, mixed, active, thermic Udic Paleustoll). ***p < 0.001.

View larger version (9K): [in this window] [in a new window]   Fig. 4. The relationship between the phosphorus saturation index calculated with acid ammonium oxalate extraction data (PSIox) and P added from biosolids for the Norge soil (fine-silty, mixed, active, thermic Udic Paleustoll). ***p < 0.001.

View larger version (9K): [in this window] [in a new window]   Fig. 5. The relationships between (a) Mehlich 3 P and P saturation index calculated with acid ammonium oxalate extraction data (PSIox) for the Norge soil (fine-silty, mixed, active, thermic Udic Paleustoll) and (B) water soluble P and PSIox for the Norge soil. ***p < 0.001.