Manure Nitrogen Management for Corn on Loess Soil in a Sensitive Groundwater Area
2005
Strock, J. S. | Schmitt, M. A.
A number of community water supplies in southwest Minnesota are threatened by nitrate contamination. Manure nitrogen (N) management experiments were conducted in southwest Minnesota from 2000 to 2003 to compare manure management practices (timing, rate, and method of application) for preventing negative nitrate-nitrogen (NO₃-N) impacts on shallow ground water. Differences among manure rates produced a significant corn grain yield response in one out of four years. Mean soil inorganic N concentrations measured throughout the season showed significant soil NO₃-N differences for all manure rates in all years. Mean cornstalk NO₃-N concentrations also showed significant cornstalk NO₃-N differences for all manure rates in all years. When used to evaluate manure N management outcomes, sensible manure management practices along with N diagnostic testing can be excellent comprehensive management tools for livestock producers.
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