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).
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