SOLUBLE PHOSPHORUS LEACHING FROM CORN SYSTEMS

Equilibrium-tension lysimeters were used to evaluate and compare dissolved reactive phosphorus (DRP) leaching from a prairie and fertilized no-tillage and chisel-plowed corn agroecosystems on Plano silt loam (fine-silty, mixed, superactive, mesic Typic Argiudolls) in south central Wisconsin during four monitoring periods, March through April 1996, 1997, and 1998, and from January 1999 through September 2000. A low level of soluble P was found to leach from both natural and managed ecosystems. Dissolved reactive P leaching losses were higher from the managed compared to the natural ecosystems. The fertilized notillage agroecosystem consistently maintained higher DRP concentrations in soil leachate solutions compared to the fertilized chisel-plowed agroecosystem, which led to higher DRP leaching losses for the fertilized no-tillage agroecosystem, despite greater drainage from the fertilized chisel-plowed compared to the fertilized no-tillage agroecosystem. Soluble P leaching losses measured for a prairie and fertilized agroecosystems in south central Wisconsin were below acceptable critical limits for P loss.

[1]  S. T. Gower,et al.  Water-budget evaluation of prairie and maize ecosystems. , 2000 .

[2]  P. Brookes,et al.  Development of an Indicator for Risk of Phosphorus Leaching , 2000 .

[3]  O. F. Schoumans,et al.  Modeling Soil Phosphorus Levels and Phosphorus Leaching from Agricultural Land in the Netherlands , 2000 .

[4]  M. L. Thompson,et al.  Redistribution of Biosolids‐Derived Total Phosphorus Applied to a Mollisol , 1999 .

[5]  P. Hooda,et al.  Phosphorus Loss in Drainflow from Intensively Managed Grassland Soils , 1999 .

[6]  S. T. Gower,et al.  An Equilibrium Tension Lysimeter for Measuring Drainage through Soil , 1999 .

[7]  D. Correll.  THE ROLE OF PHOSPHORUS IN THE EUTROPHICATION OF RECEIVING WATERS: A REVIEW , 1998 .

[8]  B. Joern,et al.  Phosphorus loss in agricultural drainage: historical perspective and current research , 1998 .

[9]  David D. Baltensperger,et al.  Phosphorus Movement and Adsorption in a Soil Receiving Long-Term Manure and Fertilizer Application , 1996 .

[10]  C. Reece.  Evaluation of a Line Heat Dissipation Sensor for Measuring Soil Matric Potential , 1996 .

[11]  Keith Goulding,et al.  Phosphorus Leaching from Soils Containing Different Phosphorus Concentrations in the Broadbalk Experiment , 1995 .

[12]  Gene E. Likens,et al.  Biogeochemistry of a Forested Ecosystem , 1978, Springer New York.

[13]  J. Sims,et al.  PHOSPHORUS AVAILABILITY AND SORPTION IN AN ATLANTIC COASTAL PLAIN WATERSHED DOMINATED BY ANIMAL‐BASED AGRICULTURE , 1994 .

[14]  H. Golterman,et al.  Eutrophication of Lakes, Rivers and Coastal Seas , 1991 .

[15]  J. H. Peverly,et al.  Nitrogen and Phosphorus Losses from Organic Soils , 1978 .

[16]  J. P. Riley,et al.  A modified single solution method for the determination of phosphate in natural waters , 1962 .

[17]  R. H. Bray,et al.  DETERMINATION OF TOTAL, ORGANIC, AND AVAILABLE FORMS OF PHOSPHORUS IN SOILS , 1945 .