Crop Yields and Phosphorus Loss with Surface Runoff as Affected by Tillage Systems and Phosphorus Sources

Antonio P. Mallarino; Mazhar Ul Haq; Matthew J. Helmers; Ryan Rusk

Northwest and Allee Research and Demonstration Farms

Crop Yields and Phosphorus Loss with Surface Runoff as Affected by Tillage Systems and Phosphorus Sources

Authors: Antonio P. Mallarino (Iowa State University) , Mazhar Ul Haq (Iowa State University) , Matthew J. Helmers (Iowa State University) , Ryan Rusk (Iowa State University)

Abstract

Excess sediment, phosphorus (P) and/or nitrogen (N) impair many Iowa lakes and streams. Most of the sediment and P originate from fields and stream banks. Previous research was based on rainfall simulations. This technique provided useful information about potential differences between management practices, but estimated poorly long-term differences and total losses. Little work has been conducted elsewhere in Iowa to study P loss with surface runoff based on natural rainfall and large-scale plots. Therefore, a long-term study was established to investigate effects of corn and soybean production, tillage, and fertilizer or manure P management system on crop yield and loss of soil and P with runoff.

Keywords: RFR A9089, Agronomy

How to Cite: Mallarino, A. P. , Haq, M. U. , Helmers, M. J. & Rusk, R. (2010) “Crop Yields and Phosphorus Loss with Surface Runoff as Affected by Tillage Systems and Phosphorus Sources”, Iowa State University Research and Demonstration Farms Progress Reports. 2009(1).