Download or read book A Study of Nitrogen Transformations in Soil Columns written by Elmo Lyman Dinkins and published by . This book was released on 1977 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nitrogen Transformations in Soil Columns Under Continuous Culture written by Chakrapani Misra and published by . This book was released on 1973 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of the Relationships Between Trace Metals and Nitrogen Transformations in Soils written by Fu-Hsian Chang and published by . This book was released on 1979 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Simulation of Nitrogen Movement Transformation and Uptake in Plant Root Zone written by James M. Davidson and published by . This book was released on 1978 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Use of 15N to Study Nitrogen Transformations in Land Treatment written by Thomas F. Jenkins and published by . This book was released on 1979 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study was to compare different strategies of using 15N as a tracer to describe the fate of wastewater N in land application of wastewater. Four soil columns were packed with Windsor sandy loam soil and covered with forage grass. The columns were treated with 7.5 cm of either tapwater or wastewater according to four experimental strategies. The strategies varied the treatment given the soil prior to application of the 15N label, the schedule and amounts of the applied 15N label, and the type of water used for subsequent column leaching. Soil solution at depth and leachate were analyzed weekly for concentration and 15N content of nitrate and ammonium. Plant samples were obtained periodically throughout the experiment and, together with soil samples collected at the end of the experiment, analyzed for total nitrogen content and 15N/14N ratios. The results indicate that nitrification occurred rapidly in the column preconditioned with wastewater, and the resulting labeled nitrogen moved in a narrow band through the soil profile. In the other columns, nitrification was delayed, resulting in the formation of a lower total amount of labeled nitrate as well as a more diffuse band. A strategy consisting of a single application of the 15N label in wastewater with a high enrichment, preceded and followed by wastewater applications, permitted the monitoring of nitrification, movement of NO3( - ) in the soil and plant uptake subsequent to application of the label. The other strategies were found to be useful for obtaining specific types of information relative to the operation of land treatment systems and other soil N pathways. (Author).
Download or read book A Systems Study of the Transport and Transformations of Soil Nitrogen written by Fred J. Endelman and published by . This book was released on 1973 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Model Study of Nitrogen Transformations During Wastewater Infiltration Into Soil written by Hua Chi Chen and published by . This book was released on 1983 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soil Plant Nitrogen Relationships written by Donald R. Nielsen and published by Elsevier. This book was released on 2013-09-03 with total page 543 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrogen in the Environment, Volume 2: Soil-Plant-Nitrogen Relationships is the second of a two-volume treatise based on manuscripts presented at the international conference on ""Nitrogen in the Environment,"" held at the University of California Conference Center, Lake Arrowhead, in February, 1977. All original manuscripts were revised in accordance with discussions at the conference. The chapters published in these volumes are those revised manuscripts, with provisions in each chapter to preserve the major suggestions for their improvement. These two volumes—Nitrogen Behavior in Field Soil and Soil-Plant-Nitrogen Relationships—should be of value in bringing into perspective current knowledge on selected aspects of nitrogen in the environment. The book contains 22 chapters and opens with a study on the factors influencing nitrate acquisition by plants; assimilation and fate of reduced nitrogen. Separate chapters follow on topics such as absorption and utilization of ammonium nitrogen by plants; potential nitrate levels in edible plant parts; control of biological nitrogen fixation; and methods for analysis of denitrification in soils.
Download or read book Biochar Application written by T. Komang Ralebitso-Senior and published by Elsevier. This book was released on 2016-05-07 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biochar Application: Essential Soil Microbial Ecology outlines the cutting-edge research on the interactions of complex microbial populations and their functional, structural, and compositional dynamics, as well as the microbial ecology of biochar application to soil, the use of different phyto-chemical analyses, possibilities for future research, and recommendations for climate change policy. Biochar, or charcoal produced from plant matter and applied to soil, has become increasingly recognized as having the potential to address multiple contemporary concerns, such as agricultural productivity and contaminated ecosystem amelioration, primarily by removing carbon dioxide from the atmosphere and improving soil functions. Biochar Application is the first reference to offer a complete assessment of the various impacts of biochar on soil and ecosystems, and includes chapters analyzing all aspects of biochar technology and application to soil, from ecogenomic analyses and application ratios to nutrient cycling and next generation sequencing. Written by a team of international authors with interdisciplinary knowledge of biochar, this reference will provide a platform where collaborating teams can find a common resource to establish outcomes and identify future research needs throughout the world. Includes multiple tables and figures per chapter to aid in analysis and understanding Includes a comprehensive table of the methods used within the contents, ecosystems, contaminants, future research, and application opportunities explored in the book Includes knowledge gaps and directions of future research to stimulate further discussion in the field and in climate change policy Outlines the latest research on the interactions of complex microbial populations and their functional, structural, and compositional dynamics Offers an assessment of the impacts of biochar on soil and ecosystems
Download or read book Modelling Nitrogen from Farm Wastes written by John Kenneth Russell Gasser and published by Elsevier Science & Technology. This book was released on 1979 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nitrogen Turnover in the Soil Crop System written by J.J. Groot and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the Netherlands the Institute for Soil Fertility Research plays a major role in soil biological, soil physical and plant nutritional research on the availability of nitrogen to crops. Main subjects of research are nitrogen turnover in the crop-soil ecosystem through biological transformations, nitrogen transport through the soil and nitrogen losses by leaching, denitrification and volatilization, and nitrogen use efficiency of various crops and cropping systems. The current knowledge in the different fields of research is integrated in simulation models. Simulation models not only make it possible to summarize and structure knowledge, but also, after verification, to extra- late the knowledge to situations different from the situations that have actually been studied. Such research is also carried out in other European and non-European countries. To compare the various simulation models currently in use, a workshop was organized by the Institute for Soil Fertility Research on 5-6 June 1990 on the occasion of its centennial. The title of the workshop was 'Nitrogen turnover in the soil-crop ::cosystem: modelling of biological transformations, transport of nitrogen and nitrogen use efficiency'. The 40 Jarticipants, who came from Canada and various European countries, were requested to run their model with data Jrovided by the Institute prior to the workshop. Data from 18 cases were made available to the participants: three ocations, three treatments, and two seasons.
Download or read book Nitrogen Transformations During Continuous Flow written by James LeRoy Starr and published by . This book was released on 1973 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CRC Handbook of Laboratory Model Systems for Microbial Ecosystems written by Julian W.T. Wimpenny and published by CRC Press. This book was released on 1988-10-31 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: These volumes present the main classes of useful laboratory model systems used to study microbial ecosystems, with emphasis on the practical details for the use of each model. The most commonly used model, the homogeneous fermenter, is featured along with linked homogeneous culture systems, film fermenters, and percolating columns. Additionally, gel-stabilized culture systems which incorporate molecular diffusion as their main solute transfer mechanism and the microbial colony are explained. Chapters comparing model systems with "microcosms" are included, along with discussions of the value of computer models in microbial ecosystem research. Highlighted is a global discussion of the value of laboratory models in microbial ecology.
Download or read book Nitrates in Groundwater written by Larry W. Canter and published by Routledge. This book was released on 2019-01-22 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: This time-saving book provides extensive coverage of all important aspects of nitrates in groundwater, ranging from prevention to problem assessment to remediation. It begins by highlighting the nitrogen cycle and related health concerns, providing both background information and a unique perspective on health issues. It then analyzes subsurface pr
Download or read book The Transport and Transformations of Nitrogen and Dissolved Organic Carbon from Liquid Swine Manure Applied on Soil Columns written by Kimberley Anne Sutherland and published by . This book was released on 1994 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Variation in Soil Nitrogen Retention Across Land Uses Landscapes and Landforms in Central Pennsylvania written by Julie Weitzman and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The global nitrogen (N) cycle has been substantially altered by human activities like land-use change with natural inputs of N to the biosphere now exceeded by anthropogenic inputs. These shifts have led to increased availability and mobility of N, which in turn can change the rates and pathways of N cycling and loss. It is not clear, however, the extent to which the fate of newly deposited N varies across ecosystems, nor which mechanisms play major roles in driving such differences. Thus, as the global N cycle continues to change due to human impacts, understanding variation in soil N retention and loss across different ecosystems becomes ever more important. The ultimate objective of this dissertation was to assess the major pathways of N transport and transformation in different land-uses prominent in central Pennsylvania.In order to better understand the possible fate of N deposition and its contribution to both internal and external N cycling processes a watershed N budget was constructed for the Shale Hills Critical Zone Observatory (CZO) a 7.9-ha forested, first-order catchment in central PA known to receive high inputs of atmospheric N. Results showed that inputs of N to the Shale Hills CZO were greater than outputs, with plant biomass and soils acting as major sinks for deposited N. Ultimately, these results suggest that forests can retain a large portion of inorganic N inputs. To determine the possible mechanism for such high N retentive capacities in forests, and whether other land-uses behave similarly, a 15N labeling study was conducted to quantify the soil sink strength for inorganic N in forest, urban, and agricultural ecosystems. The rate and magnitude of soil N retention in the different land-uses was measured by separating total soil N and 15N into labile and stable pools using long-term incubations with repeated leaching. Pathways of N retention were found to vary dramatically among land-use types, with forests stabilizing the most new N inputs, followed by urban and agricultural systems. These differences in N stabilization are largely due to differences in the pathways of N retention that are active in each land-use. Lastly, to understand how management practices might impact ecosystems known to be poor N retainers, N retention in soils of a legacy sediment impacted stream reach was studied. Intact soil columns were extracted from three distinct soil horizons, with the surface and mid-layer horizons characterized as agricultural soils, while the deepest layer served as a proxy for a buried forest soil. Each soil column was isotopically labeled with 15NO3- and then subjected to drought conditions followed by a rewetting event. Low initial 15N retention in all three soil horizons was largely balanced by leaching losses, providing evidence for N saturation in such systems. Further, evidence of NO3- flushing following the rewetting of the dry soil horizons suggests that a fluctuating water table could release stored NO3- to nearby waterways. Thus, it appears that the expected N removal capacity of one soil horizon can be impacted by the long-term burial beneath another soil horizon that is characteristic of a different land-use. Overall, this dissertation shows that the cycling of N is dynamic across different ecosystems, and that as anthropogenic N inputs continue to increase, it will be important to document the dominate pathways of N retention in different ecosystems in order to help us to better manage N losses.
Download or read book Studies on Soil Structure written by James Frank Breazeale and published by . This book was released on 1937 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
