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Phosphorus Leaching under a Restored Tallgrass Prairie and Corn Agroecosystems

^a Dep. of Crop, Soil, and Environmental Sciences, Univ. of Arkansas, 115 Plant Sciences Building, Fayetteville, AR 72701
^b Dep. of Soil Science, Univ. of Wisconsin, 1525 Observatory Dr., Madison, WI 53706-1299
^c Environmental Resources Center, Univ. of Wisconsin, 1450 Linden Dr., Madison, WI 53706

View larger version (33K): [in a new window]   Fig. 1. Soil organic matter, 1:1 soil to water pH, and water- and Bray-extractable soil P at several depths in April 1995 (i.e., 0–30, 30–60, 60–90, and 90–120 cm) and November 2000 (i.e., 0–5, 5–15, 15–30, 30–60, 60–90, and 90–120 cm) for the prairie and N-fertilized (f) or unfertilized (nf) and no-tillage (NT) or chisel-plowed (CP) corn ecosystems.

View larger version (29K): [in a new window]   Fig. 2. Relationship between volume-weighted molybdate-reactive phosphorus (MRP) in leachate during May through July 2000 and water-extractable soil P from November 2000, uncorrected for the extractant volume to soil extracted ratio, at several depths for the prairie (P) and N-fertilized (f) or unfertilized (nf) and no-tillage (NT) or chisel-plowed (CP) corn agroecosystems. Standard error bars are provided for replicate leachate MRP and water-extractable soil P concentrations.

View larger version (31K): [in a new window]   Fig. 3. Cumulative molybdate-reactive phosphorus (MRP) leaching losses for the prairie and N-fertilized (f) no-tillage (NT) and chisel-plowed (CP) corn ecosystems from January 1999 through September 2000. Standard error bars are provided for replicate MRP measurements.

View larger version (23K): [in a new window]   Fig. 4. Ratio of leaching losses of molybdate-reactive phosphorus (MRP) in the N-fertilized (f) or unfertilized (nf) and no-tillage (NT) or chisel-plowed (CP) corn agroecosystems, relative to prairie MRP leaching losses, from January 1999 through September 2000. Standard error bars are provided for replicate measurements. Note the logarithmic scale on the y axis.