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Alan L. Wright, Tony L. Provin, Frank M. Hons, David A. Zuberer and Richard H. White

Application of organic amendments can increase dissolved organic C (DOC) concentrations, which may influence movement of nutrients and heavy metals in soils. The objectives of this study were to investigate the influence of compost sources and application rates on concentrations of soil DOC, NO3-N, and extractable P over 29 months after a one-time application of compost to bermudagrass [Cynodon dactylon (L.) Pers.] turf. Few differences were evident between compost sources for soil total organic C (TOC), DOC, and NO3-N. However, the initial P content of compost sources significantly influenced soil extractable P. Increasing the rate of compost application increased soil TOC initially, but levels remained fairly stable over time. In contrast, DOC continued to increase from 3 to 29 months after application, suggesting that compost mineralization and growth of bermudagrass contributed to DOC dynamics in soil. Dissolved organic C was 98%, 128%, 145%, 175%, and 179% greater 29 months after application of 0, 40, 80, 120, and 160 Mg compost/ha, respectively, than before application. Rate of compost application had less effect on DOC than TOC, as DOC concentrations appeared controlled in part by bermudagrass growth patterns. Soil NO3-N was generally unaffected by compost application rate, as NO3-N decreased similarly for unamended soil and all compost treatments. Soil extractable P initially increased after compost application, but increasing the application rate generally did not increase P from 3 to 29 months. Seasonal or cyclical patterns of TOC, DOC, and extractable P were observed, as significantly lower levels of these parameters were observed in dormant stages of bermudagrass growth during cooler months.

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Tim R. Pannkuk, Jacqueline A. Aitkenhead-Peterson, Kurt Steinke, James C. Thomas, David R. Chalmers and Richard H. White

. Dissolved organic carbon and total dissolved N (TDN) were measured with high-temperature Pt-catalyzed combustion using a Shimadzu TOC-V CSH and a Shimadzu total measuring unit (TNM-1). DOC was measured as non-purgeable carbon using USEPA method 415.1, which

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Xiaoyan Dai, Donald M. Vietor, Frank M. Hons, Tony L. Provin, Richard H. White, Thomas W. Boutton and Clyde L. Munster

. Environ. Qual. 32 1694 1700 Royer, I. Angers, D.A. Chantigny, M.H. Simard, R.R. Cluis, D. 2007 Dissolved organic carbon in runoff and tile-drain water under corn and forage fertilized with hog manure J. Environ. Qual. 36 855 863 SAS Institute Inc 2000

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Adam D. Karl, Ian A. Merwin, Michael G. Brown, Rebecca A. Hervieux and Justine E. Vanden Heuvel

% and 39% greater than NV and WC DOC concentrations, respectively. Yearly average CULT DOC leachate concentrations were as much as 33% and 36% greater than NV and WC DOC concentrations, respectively. Table 6. Average annual dissolved organic carbon (DOC

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Huisen Zhu and Deying Li

/v) for both nonfumigated and chloroform-fumigated samples. Dissolved organic carbon in the extracts was determined by titration with 0.033 m acidified ferrous ammonium sulfate after dichromate digestion of the extraction. The MBC concentration was

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Alan L. Wright, Tony L. Provin, Frank M. Hons, David A. Zuberer and Richard H. White

113 211 235 McCracken, K.L. McDowell, W.H. Harter, R.D. Evans, C.V. 2002 Dissolved organic carbon retention in soils Soil Sci. Soc. Amer. J. 66 563 568 McDowell, W

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Qiansheng Li, Jianjun Chen, Russell D. Caldwell and Min Deng

. Dowrick, D.J. Reynolds, B. Lock, M.A. Sleep, D. Hughes, S. Hudson, J. 2004 Export of dissolved organic carbon from peatlands under elevated carbon dioxide levels Nature 430 195 198 Hanson, J.B. 2003 Counting on coir Greenhouse Product News 13 9 54, 48, 50

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Matthew D. Taylor, Rachel Kreis and Lidia Rejtö

Hort. 782 387 393 Freeman, C. Fenner, N. Ostle, N.J. Kang, H. Dowrick, D.J. Reynolds, B. Lock, M.A. Sleep, D. Hughes, S. Hudson, J. 2004 Export of dissolved organic carbon from peatlands under elevated carbon dioxide levels Nature 430 195 198 Huang, J

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Tim R. Pannkuk, Richard H. White, Kurt Steinke, Jacqueline A. Aitkenhead-Peterson, David R. Chalmers and James C. Thomas

specific aesthetic level in the landscape. Literature Cited Aitkenhead-Peterson, J.A. Steele, M.K. Nahar, N. Santhy, K. 2009 Dissolved organic carbon and nitrogen in urban and rural watersheds of south

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Ashley A. Thompson and Gregory M. Peck

California District Sacramento Laboratory—Determination of dissolved organic carbon in water by high temperature catalytic oxidation, method validation, and quality-control practices. High Temp. Open file report 03-366 Blanpied, G.D. Silsby, K.J. 1992