Nitrogen Behavior In Field Soil

Autor: Donald R. Nielsen
Publisher: Elsevier
ISBN: 1483273229
File Size: 17,97 MB
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Nitrogen in the Environment, Volume 1: Nitrogen Behavior in Field Soil is the first 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. This book contains 26 chapters and begins with a paper on field trials with isotopically labeled nitrogen fertilizer. Separate chapters follow on topics such as computer simulation modeling for nitrogen in irrigated croplands; spatial variability of nitrogen in soils; application of gaseous-diffusion theory to measure denitrification; and measurement and prediction of anaerobiosis in soils.

Soil Plant Nitrogen Relationships

Autor: Donald R. Nielsen
Publisher: Elsevier
ISBN: 1483273237
File Size: 47,88 MB
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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.

Nitrogen Fertilization In The Environment

Autor: Peter Bacon
Publisher: CRC Press
ISBN: 9780824789947
File Size: 52,21 MB
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This study examines the interactions between nitrogen and the ecosystem and discusses nitrogen fertilization practices around the world. Simulation models that play an important role in determining the dynamics of source-sink relationships are presented, helping to pinpoint inefficiencies and develop strategies to synchronize nitrogen supply and demand.

Environmental Bioremediation Technologies

Autor: S.N. Singh
Publisher: Springer Science & Business Media
ISBN: 3540347933
File Size: 38,80 MB
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Bioremediation is an eco-friendly, cost-effective and natural technology targeted to remove heavy metals, radionuclides, xenobiotic compounds, organic waste, pesticides etc. from contaminated sites or industrial discharges through biological means. Since this technology is used in in-situ conditions, it does not physically disturb the site unlike conventional methods i.e. chemical or mechanical methods.

Progress In Nitrogen Cycling Studies

Autor: O. van Cleemput
Publisher: Springer Science & Business Media
ISBN: 9401154503
File Size: 28,87 MB
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This book contains the proceedings of the `8th Nitrogen Workshop' which was held at the University of Ghent, Belgium, from 5 to 8 September 1994. Although nitrogen dynamics in different ecosystems have been studied for several decades, new orientations and other emphases have recently emerged. Previously, nitrogen was considered as an essential element mostly in terms of productivity, but now, more emphasis is attached to environmental consequences. More than 100 contributions in this book tackle recent developments within the fields of nitrogen advice systems, plant response to fertilization, immobilization and mobilization, nitrification, denitrification, leaching, ammonia volatilization and biological nitrogen fixation. A large number of papers is devoted to the formation of gaseous nitrogen compounds, while mineralization-immobilization is another topic of important interest. The book also contains the reports of discussion groups on different aspects of the nitrogen cycle.

Soil Microbiology

Autor: O. L. Smith
Publisher: CRC
ISBN:
File Size: 28,27 MB
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A perspective of modeling. A review of models in soil microbiology. Mathematical development. A decomposition and nutrient cycling model. Mathematical basis of the spatial approximation. The decomposers. The general microbe population. The nitrifiers. Symbols. Parameters. The carbon cycle. Disintegration of dead plant and animal matter. Free polysaccharide in soil. Bound polysaccharide. Simple sugar in soil solution. The phosphorus cycle. Free organic phosphorus in soil. Bound phosphorus. Mineral phosphorus. Soil solution phosphorus. The potassium cycle. Potassium leached from live cells. Potassium leached or dissolved from dead cells. Nonexchangeable potassium. Exchangeable potassium. Soluble mineral potassium. Atmospheric input and groundwater loss. Soil solution potassium. The nitrogen-aromatic cycle. Free organic nitrogen in soil. Bound organic nitrogen. Condensable aromatics. Soil solution NH+4. Soil solution NO-2 and NO-3. Cell chemistry. Plants. Microbes. Temperature and moisture dependence of processes. Organic and inorganic reactions. The role of plants in decomposition and nutrient cycling. Model development. Comparison of model with experiment. Comparison of model with theories of plant growth. Simplified version of the plant model. The steady state. Phosphorus. Potassium. Nitrogen. The dynamic state. Overall pattern of decomposition and microbe growth. The influence of substrate carbon and nitrogen content on mineralization and immobilization. Microbe growth limited by nitrogen. Wastage of substrate. The rate-limiting step of nitrogen mineralization. The priming effect of soil amendments on rate of mineralization. Accumulation of organic matter in soils. Effect on microbes of oscillating low soil temperatures. Effect on microbes of soil moist-dry cycles. Microbe and plant competition for nutrients. Strategy of optimum crop fertilization. A look ahead. Mathematical and numerical techniques. The runge-kutta method. Solution of coupled nonlinear algebraic equations.

Agricultural Management And Water Quality

Autor: Frank W. Schaller
Publisher: Iowa State Pr
ISBN:
File Size: 68,52 MB
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Overview and issues of agriculture nonpoint source pollution; Agricultural nopoint sources and pollutant process; Predicting loads and water quality impacts; Agricultural best management practices (BMPs)- evaluation, selection, and implementation; Policy issues, trends, and summary.

Soil Emission Of Nitrous Oxide And Its Mitigation

Autor: David Ussiri
Publisher: Springer Science & Business Media
ISBN: 9400753640
File Size: 71,75 MB
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Nitrous oxide gas is a long-lived relatively active greenhouse gas (GHG) with an atmospheric lifetime of approximately 120 years, and heat trapping effects about 310 times more powerful than carbon dioxide per molecule basis. It contributes about 6% of observed global warming. Nitrous oxide is not only a potent GHG, but it also plays a significant role in the depletion of stratospheric ozone. This book describes the anthropogenic sources of N2O with major emphasis on agricultural activities. It summarizes an overview of global cycling of N and the role of nitrous oxide on global warming and ozone depletion, and then focus on major source, soil borne nitrous oxide emissions. The spatial-temporal variation of soil nitrous oxide fluxes and underlying biogeochemical processes are described, as well as approaches to quantify fluxes of N2O from soils. Mitigation strategies to reduce the emissions, especially from agricultural soils, and fertilizer nitrogen sources are described in detail in the latter part of the book.