Impacts of Phosphorus and Tillage Management Systems for Corn and Soybean Production on Soil and Phosphorus Loss with Surface Runoff—A New Long-Term Study

Antonio P. Mallarino; Matthew J. Helmers; David Haden

Northwest and Allee Research and Demonstration Farms

Impacts of Phosphorus and Tillage Management Systems for Corn and Soybean Production on Soil and Phosphorus Loss with Surface Runoff—A New Long-Term Study

Authors: Antonio P. Mallarino (Iowa State University) , Matthew J. Helmers (Iowa State University) , David Haden (Iowa State University)

Abstract

Excess sediment, phosphorus(P) and/or nitrogen (N) impair most Iowa lakes and many streams. Most of the sediment and nutrients originate from agricultural fields or stream banks. Previous research on P loss with surface runoff in the Northwest Iowa region was based on short-term rainfall simulations and included a limited set of conditions. The rainfall simulations provided useful information about potential differences between management practices but could not measure long-term differences or annual sediment and P loads. Very limited work has been conducted elsewhere in Iowa to study P loss with runoff based on natural rainfall and large-scale plots.

Keywords: Agronomy

How to Cite: Mallarino, A. P. , Helmers, M. J. & Haden, D. (2008) “Impacts of Phosphorus and Tillage Management Systems for Corn and Soybean Production on Soil and Phosphorus Loss with Surface Runoff—A New Long-Term Study”, Iowa State University Research and Demonstration Farms Progress Reports. 2007(1).