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International Journal of AgronomyVolume 2012 2012, Article ID 508986, 12 pages

Research ArticleDepartment of Agricultural and Environmental Sciences, Tuskegee University, Tuskegee, AL 36088, USA

Received 22 December 2011; Accepted 19 March 2012

Academic Editor: Dexter B. Watts

Copyright © 2012 Kokoasse Kpomblekou-A and Andrae Genus. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Nitrogen mineralization rates in ten surface soils amended with 200 μg N g

soil or without broiler litter were investigated. The soil-broiler litter mixture was incubated at for 28 weeks. A nonlinear regression approach for N mineralization was used to estimate the readily mineralizable organic N pools and the first-order rate constant k. The cumulative N mineralized in the nonamended soils did not exceed 80 mg N kg

soil. However, in Decatur soil amended with broiler litter 2, it exceeded 320 mg N kg

soil. The greatest calculated of the native soils was observed in Sucarnoochee soil alone 123 mg kg

soil which when amended with broiler litter 1 reached 596 mg N kg

soil. The added broiler litter mineralized initially at a fast rate k1 followed by a slow rate k2 of the most resistant fraction. Half-life of organic N remaining in the soils alone varied from 33 to 75 weeks and from 43 to 15 weeks in the amended soils. When was regressed against soil organic N and C , positive linear relationships were obtained. The pools increased with sand but decreased with silt and clay contents.

Autor: Kokoasse Kpomblekou-A and Andrae Genus



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