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Changes in Bicarbonate-extractable Inorganic and Organic Phosphorus by Drying Pasture Soils

Institute of Grassland and Environmental Research, North Wyke Research Station, Okehampton, Devon EX20 2SB, UK

View larger version (21K): [in a new window]   Fig. 1. The relationship between bicarbonate-extractable organic P (mg P kg-1 soil) and soil pH for 29 permanent lowland pasture soils from England and Wales extracted at approximate field-capacity moisture content and after air-drying at 30°C for 7 d. The curves describe the following models: [Bicarbonate organic P from moist soil] = 9023[soil pH]-3.82, R2 = 0.49, P < 0.0001; and [Bicarbonate organic P from dry soil] = 5034[soil pH]-3.22, R2 = 0.60, P < 0.0001.

View larger version (16K): [in a new window]   Fig. 2. The relationship between oxalate-extractable Al (g Al kg-1 soil) and the increase in bicarbonate-extractable inorganic P (mg P kg-1 soil) following air-drying at 30°C for 7 d in 29 permanent lowland pasture soils from England and Wales.

View larger version (15K): [in a new window]   Fig. 3. The relationships between the proportional increase (%) in (top) bicarbonate-extractable inorganic P and (bottom) bicarbonate-extractable organic P following air-drying at 30°C for 7 d and the initial concentrations (mg P kg-1 soil) in 29 permanent lowland pasture soils from England and Wales.