nitrogen

Javed Iqbal, Magdalena Necpalova, Sotirios V. Archontoulis, Robert P. Anex, Marie Bourguignon, Daryl Herzmann, David C. Mitchell, John E. Sawyer, Qing Zhu, Michael J. Castellano

Limiting Nitrogen Immobilization in Cover Crop Systems
Funded by the Iowa Nutrient Reduction Strategy

Issue: Cover crops have significant potential to improve water quality by limiting erosion when row crops are not growing, and by limiting the loss of nitrogen by leaching. Yet widespread adoption has been limited, as the yield of subsequent-year corn crops may be negatively affected by cover crops. One reason for this is the potential for immobilization of nitrogen from soil organic matter as cover crop residues decompose.

Impacts of cover crops on phosphorus and nitrogen loss with surface run off
Funded by the Iowa Nutrient Reduction Strategy

Issue: Cover crops are a recognized conservation practice to reduce soil erosion, and Iowa research has shown a winter cereal rye cover crop greatly reduces nitrate loss with subsurface drainage. However, little research has evaluated the impact of cover crops on total and dissolved nitrogen (N) and phosphorus (P) loss with surface runoff.

Does Quantity and Quality of Tile Drainage Water Impact In-stream Eutrophication Potential? Evidence from a Long-term Biofuel Cropping Systems Experiment
Funded by the Iowa Nutrient Reduction Strategy

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