Author
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Griffin, Timothy |
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Submitted to: Agricultural Research Service Publication
Publication Type: Proceedings Publication Acceptance Date: 2/1/2004 Publication Date: 3/15/2004 Citation: Griffin, T.S. 2004. Mineralization of manure organic nitrogen. Proceedings of First Annual Ontario N Conference. Interpretive Summary: Technical Abstract: There are many sources of plant-available nitrogen (PAN) in grain and forage production systems. Principle among these sources are nitrogen (N) fertilizer, legume crops capable of fixing atmospheric N, soil organic matter N (SOM-N), and both mineral and organic N fractions of livestock manures. Although the management of synthetic N fertilizer has received considerable attention, the release or mineralization of N from organic compounds in manure and soil can be equal to or greater than fertilizer N inputs in many cropping systems. Using aerobic incubation methodology, quantitative relationships have been developed describing the effects of temperature, soil moisture, and soil texture on organic N mineralization. The impact of manure composition as a controlling factor is not as clearly defined. Scaling upwards from controlled incubations to field- or farm level prediction of N availability remains a substantial challenge, as does reconciling current recommendations with information from the research base, and estimating nitrogen available from past manure applications. |
