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

root exudates and microbial metabolites ( Marschner and Kalbitz, 2003 ). Dissolved organic matter is often considered refractory but mobile in soils ( Qualls and Haines, 1992 ). Accumulation of nutrients in compost-amended soils may pose environmental

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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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Menahem Edelstein, Meni Ben-Hur and Zui Plaut

types of water were analyzed, and their ionic compositions and concentrations are presented in Table 1 . The dissolved organic matter in the water was determined with a combustion TOC analyzer (Skalar Analytical B.V., Breda, the Netherlands), and the

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

·ha −1 at CS ( Pannkuk et al., 2010 ). Dissolved organic N, a subset of dissolved organic matter that includes DOC, is often strongly and significantly related to DOC in undisturbed ecosystems ( Aitkenhead-Peterson et al., 2003 ). In our study, we found

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Timothy K. Hartz and Thomas G. Bottoms

agricultural soils. In nutrient solution studies, plant growth response to HS tended to peak at less than 100 mg·L −1 ( Chen and Aviad, 1990 ). Native soil dissolved organic matter (DOM), which can perform some of the same functions as applied HA ( Chen et al

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Kevin R. Kosola and Beth Ann A. Workmaster

; Read and Bajwa, 1985 ). There is ample organic matter present in Wisconsin cranberry beds that are more than 3 to 5 years old, because leaf litter accumulates quickly and decomposes slowly ( Davenport and DeMoranville, 1993 ). Dissolved organic matter

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Zhi Quan, Bin Huang, Caiyan Lu, Yi Shi, Yanhong Cao, Yongzhuang Wang, Chuanrui He, Guangyu Chi, Jian Ma and Xin Chen

.P. 2008 Phosphorus and nitrogen sorption to soils in the presence of poultry litter-derived dissolved organic matter J. Environ. Qual. 37 154 163 Guo, R. Li, X. Christie, P. Chen, Q. Jiang, R. Zhang, F. 2008 Influence of root zone nitrogen management and a

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Lantian Du, Baojian Huang, Nanshan Du, Shirong Guo, Sheng Shu and Jin Sun

composition of dissolved organic matter in agroecosystems: Correlations with soil enzyme activity and carbon and nitrogen mineralization Appl. Soil Ecol. 46 426 435 Wei, T. Cheng, Z. Khan, M.A. Ma, Q. Han, L. 2011 The inhibitive effects of garlic bulb crude

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Pengpeng Duan, Ying Sun, Yuling Zhang, Qingfeng Fan, Na Yu, Xiuli Dang and Hongtao Zou

excess NO 3 − –N in dissolved organic matter ( Fang et al., 2009 ). Additionally, in the N-rich greenhouse soil, the uptake by soil microorganisms of low-weight soil soluble organic N may primarily provide them with C to fuel respiration ( Christou et al

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

Overview of the status and global strategy for neonicotinoids J. Agr. Food Chem. 59 2897 2908 Kalbitz, K. Park, J.H. 2000 Controls on the dynamics of dissolved organic matter in soils: A review Soil Sci. 165 277 304 Karl, A.D. 2015 Impact of under