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Bioavailable Phosphorus in Runoff from Alfalfa, Smooth Bromegrass, and Alfalfa–Smooth Bromegrass

^a CNH Soil Management Division, Rt. 150 E., P.O. Box 65, Goodfield, IL 61742
^b Soil Tech Inc., 5720 Smetana Dr., Minnetonka, MN 55343
^c Dep. of Agronomy, 1575 Linden Dr., Univ. of Wisconsin-Madison, Madison, WI 53706

View larger version (21K): [in a new window]   Fig. 1. Concentration of soil Bray-1 P from 0 to 1 cm sampling depth compared with a 0 to 7 cm sampling depth. Samples taken at the time of simulated rainfall in July 1993 and July 1994. Recommended P fertilizer was broadcast in the fall of 1993.

View larger version (28K): [in a new window]   Fig. 2. Relationship between forage DM yield (present when a 72 ± 6 mm simulated rainfall was applied for 1 h) and total BAP loss in runoff. Values represent BAP loss from individual simulated rainfall events in 1993 and 1994 for alfalfa, alfalfa–smooth bromegrass, and smooth bromegrass at all stages of regrowth.