Campus Units

Agricultural and Biosystems Engineering

Document Type

Conference Proceeding

Conference

9th International Drainage Symposium held jointly with CIGR and CSBE/SCGAB

Publication Version

Published Version

Publication Date

6-13-2010

Journal or Book Title

Proceedings of the 9th International Drainage Symposium held jointly with CIGR and CSBE/SCGAB

First Page

711P0610e

DOI

10.13031/2013.32136

Conference Title

9th International Drainage Symposium held jointly with CIGR and CSBE/SCGAB

Conference Date

June 13-17, 2010

City

Québec City, Québec, Canada

Abstract

Phosphorus is one of the most important and essential mineral nutrients for corn and soybean production. Phosphorus is primarily transported to surface water bodies with surface runoff from agricultural fields as it is strongly absorbed to the soil particles. However, small amounts of dissolved phosphorus lost with subsurface drainage water can be immediately available for accelerating eutrophication in surface water bodies at critical phosphorus concentrations of 10 to 20 gL-1. A long-term subsurface drainage water quality study was conducted at the Nashua research site located in the Northeast part of Iowa, USA. The overall goal of this study was to investigate the effects of the application of swine manure and commercial fertilizer (ammonium nitrate, UAN) on phosphorus leaching to subsurface drainage water under a corn-soybean rotation. Effects of different application timings and rates were also evaluated in this long-term study (2001-2006). The results of this study indicated that phosphorus concentrations in subsurface drain water, from all experimental treatments, were highly variable and not consistent with the amount of phosphorus applied from swine manure and/or fertilizer. Manure applications at higher rates however, resulted in significantly higher phosphorus concentrations (p=0.05) in subsurface drain water in comparison to other treatments in the soybean year. Spring manure applications generally showed lower phosphorous concentration in subsurface drain water in comparison with fall manure applications, although differences were not statistically significant (p=0.05).

Comments

This proceeding is published as Hoang, Chi Kim, Kanwar, Ramesh, and Pederson, Carl. "Phosphorus Losses though Subsurface Drainage in a Loamy Soil of Iowa: Effects of Rates, Timing and Method of Swine Manure and Fertilizer Application." From an ASABE conference presentation in Proceedings of the 9th International Drainage Symposium held jointly with CIGR and CSBE/SCGAB (2010): 711P0610e. DOI: 10.13031/2013.32136. Posted with permission.

Copyright Owner

American Society of Agricultural and Biological Engineers

Language

en

File Format

application/pdf

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