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The Selective Removal of Phosphorus from Soil

Is Event Size Important?

^a Institute of Water and Environment, Cranfield University, Silsoe, Bedford MK45 4DT, United Kingdom
^b Soil Science Department, IACR-Rothamsted, Harpenden, Herts AL5 2JQ, United Kingdom

View larger version (18K): [in a new window]   Fig. 1. The proportion of soil lost as clay (<2 µm) plotted against total soil loss for the 47 events from 1988 to 1994 at the Woburn Erosion Reference Experiment. The dotted line gives the percentage of clay in the parent soil

View larger version (16K): [in a new window]   Fig. 2. Relationship between P concentration and percentage of clay-sized material in the eroded sediment from all plot events at the Woburn Erosion Reference Experiment (1988–1994)

View larger version (17K): [in a new window]   Fig. 3. The relationship between P concentration in the eroded sediment and event magnitude, represented by the total soil loss per event, for all plot events in the Woburn Erosion Reference Experiment (1988–1994)

View larger version (10K): [in a new window]   Fig. 4. Relationship between the amount of P in the eroded sediment and event magnitude, represented by the event soil loss, for all plot events in the Woburn Erosion Reference Experiment (1988–1994)

View larger version (15K): [in a new window]   Fig. 5. Percent of total P loss for each event (1988–1994) plotted against percent of the total soil loss for Plot 7 (up and down slope, minimal tillage) of the Woburn Erosion Reference Experiment (1988–1994)

View larger version (12K): [in a new window]   Fig. 6. Relationship between event soil loss and (A) peak discharge and (B) flow duration for plot events with automatic discharge records in the Woburn Erosion Reference Experiment

View larger version (20K): [in a new window]   Fig. 7. Relationship between P concentrations and (A) peak discharge and (B) flow duration for plot events with automatic discharge records at the Woburn Erosion Reference Experiment. The points inside the dotted line represent events after the harvest of sugar beet in autumn of 1992

View larger version (18K): [in a new window]   Fig. 8. Effect of treatments on (A) the mean event sediment P loss and (B) the total sediment P loss from the Woburn Erosion Reference Experiment (1988–1994). U = cultivations up and down the slope, A = cultivations across the slope, M = minimal tillage with residues retained, and S = standard tillage with residues removed. Bars indicate one standard error

View larger version (33K): [in a new window]   Fig. 9. Sediment P loss for events with return periods of 0.5, 1, 2, and 6 yr, for each of the plots of the Woburn Erosion Reference Experiment. U = cultivations up and down the slope, A = cultivations across the slope, M = minimal tillage with residues retained, and S = standard tillage with residues removed

View larger version (16K): [in a new window]   Fig. 10. Relationship between P loss and event return period for Plot 3, with across-slope minimal tillage (•) and Plot 7, with up and down–slope standard cultivation () in the Woburn Erosion Reference Experiment