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Impact of Nitrification Inhibitor Use on Corn Yield and Soil Nitrogen Levels from Liquid Hog Manure Applied at Various Fall Timings

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Title: Impact of Nitrification Inhibitor Use on Corn Yield and Soil Nitrogen Levels from Liquid Hog Manure Applied at Various Fall Timings
Author: Jackson, Kathryn
Department: School of Environmental Sciences
Program: Environmental Sciences
Advisor: Lauzon, John
Abstract: Manure applied in early with warmer temperatures can have higher nitrification rates and nitrogen loss potential, but waiting for cooler conditions in later fall risks an early winter conditions that may prevent application. Nitrate is susceptible to leaching and denitrification, which potentially could be minimized by including a nitrification inhibitor (NI) when applying manure. In this three-year study on corn, nitrapyrin was incorporated into liquid hog manure and applied at various fall timings and in spring. Soil samples were collected in the preceding fall, spring, and post-harvest, and plant nitrogen content, grain and stover were measured in the growing season. The seasonal manure application timing had a greater impact on plant responses than including the inhibitor, with spring manure applications having greater yields. It was found that there was an optimal window in November where fall-applied manure treatments had an economic benefit to being applied with a nitrification inhibitor.
URI: http://hdl.handle.net/10214/17383
Date: 2019-08
Rights: Attribution 4.0 International
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Attribution 4.0 International Except where otherwise noted, this item's license is described as Attribution 4.0 International