Download or read book Optimizing Nitrogen Management to Achieve Agronomic and Environmental Goals in Rice Production written by Cameron Mark Pittelkow and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Optimizing nitrogen (N) management is a critical component of meeting yield potential and increasing global food supply while reducing environmental impacts from agriculture. The objective of this dissertation was to evaluate N management practices in conventional and alternative direct-seeded rice production systems in California in order to enhance rice productivity while minimizing environmental costs, particularly concerning greenhouse gas (GHG) emissions. In Chapter 2, agronomic productivity and N requirements of resource-conserving rice establishment systems utilizing no-till stale seedbed practices for improved weed control were assessed. Without N fertilizer addition, yields were lower for alternative compared to conventional establishment systems, likely as a result of greater soil N losses. Accordingly, economic optimum nitrogen rates based on yield response to N trials indicated an additional 30 to 35 kg N ha−1 was needed to maximize returns to N in water-seeded stale seedbed systems. These results suggest that alternative establishment systems are viable from an agronomic and economic standpoint in California provided N rates are close to optimal and establishment methods are selected to target weed species of concern. In Chapters 3 and 4, the relationship between N management, crop productivity, and GHG emissions was investigated. Integrating climate change and agronomic productivity concerns, global warming potential was assessed on a yield-scaled as well as per unit area basis. It was hypothesized that in response to fertilizer N addition, yield-scaled global warming potential would be minimized at N rates that maximize yields. In a two-year on-farm experiment in water-seeded rice (Chapter 3), N2O emissions remained low regardless of N rate when a permanent flood was maintained but large N2O fluxes occurred during discrete field drainage periods prior to harvest, particularly at high N rates. In contrast, differences were not observed between N rates for CH4 emissions. Across years CH4 represented 94% of total global warming potential, thus mean annual yield-scaled global warming potential significantly decreased at optimal N rates due to increasing yields. In Chapter 4, these field results were combined with available data from the literature to evaluate yield-scaled global warming potential as a function of yield N surplus, here defined as N application rate minus the N rate at which maximum yield was achieved within each study. At surplus N rates, N2O and yield-scaled N2O emissions increased exponentially. However, CH4 emissions were not impacted by N inputs, hence yield-scaled CH4 emissions decreased with N addition. Overall, yield-scaled global warming potential was minimized at optimal N rates, decreasing by 21% compared to treatments without N addition. Balancing gains in agricultural productivity with environmental concerns, this work supports the concept that high rice yields can be achieved with minimal yield-scaled global warming potential when N inputs are closely matched with crop demand.
Download or read book Optimizing Nitrogen Management in Food and Energy Production and Environmental Protection written by J. Galloway and published by CRC Press. This book was released on 2002-01-01 with total page 1042 pages. Available in PDF, EPUB and Kindle. Book excerpt: The production of food and energy interfere with the natural nitrogen cycle of the earth. Many of these changes are beneficial, while others are detrimental to societies and the environment. The changing nature of nitrogen in the global environment crosses scientific disciplines, geographical boundaries and political divisions and challenges the creative minds of natural and social scientists, economists, engineers, business leaders and planners. The papers in this book give readers a panoramic view of the changing nature of reactive nitrogen in the global environment, enabling them to make better choices about nitrogen management in food production and consumption, energy production and use, and environmental protection.
Download or read book Optimizing Nitrogen Management and Crop Geometry in Hybrid Rice written by GEETHA DEVI T and published by . This book was released on 2000 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agriculture and the Nitrogen Cycle written by Arvin Mosier and published by Island Press. This book was released on 2013-04-10 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrogen is an essential element for plant growth and development and a key agricultural input-but in excess it can lead to a host of problems for human and ecological health. Across the globe, distribution of fertilizer nitrogen is very uneven, with some areas subject to nitrogen pollution and others suffering from reduced soil fertility, diminished crop production, and other consequences of inadequate supply. Agriculture and the Nitrogen Cycle provides a global assessment of the role of nitrogen fertilizer in the nitrogen cycle. The focus of the book is regional, emphasizing the need to maintain food and fiber production while minimizing environmental impacts where fertilizer is abundant, and the need to enhance fertilizer utilization in systems where nitrogen is limited. The book is derived from a workshop held by the Scientific Committee on Problems of the Environment (SCOPE) in Kampala, Uganda, that brought together the world's leading scientists to examine and discuss the nitrogen cycle and related problems. It contains an overview chapter that summarizes the group's findings, four chapters on cross-cutting issues, and thirteen background chapters. The book offers a unique synthesis and provides an up-to-date, broad perspective on the issues of nitrogen fertilizer in food production and the interaction of nitrogen and the environment.
Download or read book Nitrogen in Agriculture written by Khan Amanullah and published by BoD – Books on Demand. This book was released on 2018-02-01 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrogen is the most yield-restraining nutrient in crop production globally. Efficient nitrogen management is one of the most important factor for improving nitrogen use efficiency, field crops productivity and profitability. Efficient use of nitrogen for crop production is therefore very important for increasing grain yield, maximizing economic return and minimizing nitrous oxide (N2O) emission from the fields and nitrate (NO3) leaching to ground water. Integrated nitrogen management is a good strategy to improve plant growth, increase yield and yield components, grain quality and reduce environmental problems. Integrated nitrogen management (combined use of chemical + organic + bio-fertilizers) in field crop production is more resilient to climate change.
Download or read book Nitrogen in the Environment Sources Problems and Management written by R.F. Follett and published by Gulf Professional Publishing. This book was released on 2001-12-03 with total page 539 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrogen in the Environment: Sources, Problems, and Management is the first volume to provide a holistic perspective and comprehensive treatment of nitrogen from field, to ecosystem, to treatment of urban and rural drinking water supplies, while also including a historical overview, human health impacts and policy considerations. It provides a worldwide perspective on nitrogen and agriculture. Nitrogen is one of the most critical elements required in agricultural systems for the production of crops for feed, food and fiber. The ever-increasing world population requires increasing use of nitrogen in agriculture to supply human needs for dietary protein. Worldwide demand for nitrogen will increase as a direct response to increasing population. Strategies and perspectives are considered to improve nitrogen-use efficiency. Issues of nitrogen in crop and human nutrition, and transport and transformations along the continuum from farm field to ground water, watersheds, streams, rivers, and coastal marine environments are discussed. Described are aerial transport of nitrogen from livestock and agricultural systems and the potential for deposition and impacts. The current status of nitrogen in the environment in selected terrestrial and coastal environments and crop and forest ecosystems and development of emerging technologies to minimize nitrogen impacts on the environment are addressed. The nitrogen cycle provides a framework for assessing broad scale or even global strategies to improve nitrogen use efficiency. Growing human populations are the driving force that requires increased nitrogen inputs. These increasing inputs into the food-production system directly result in increased livestock and human-excretory nitrogen contribution into the environment. The scope of this book is diverse, covering a range of topics and issues from furthering our understanding of nitrogen in the environment to policy considerations at both farm and national scales.
Download or read book Rice Ratooning written by International Rice Research Institute and published by Int. Rice Res. Inst.. This book was released on 1988 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: Overview; Morphology and physiology of rice ratoons; Rice ratooning in practice; Evaluation and potential of rice ratooning; Cultural practices; Genetics and varietal improvement.
Download or read book Redesigning Rice Photosynthesis to Increase Yield written by J. E. Sheehy and published by Int. Rice Res. Inst.. This book was released on 2000 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Increasing Productivity of Intensive Rice Systems Through Site Specific Nutrient Management written by A. Dobermann (Ed) and published by Int. Rice Res. Inst.. This book was released on 2004 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nitrogen use to improve sustainable yields in agricultural systems written by Sudhakar Srivastava and published by Frontiers Media SA. This book was released on 2023-11-01 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optimizing Nitrogen Management in Food and Energy Productions and Environmental Change written by James Galloway and published by . This book was released on 2002 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optimizing Nitrogen Management in Food and Energy Production and Environmental Protection written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optimizing Yield and Crop Nitrogen Response Characterization by Integrating Spectral Reflectance and Agronomic Properties in Sugarcane and Rice written by Yumiko Kanke and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Rice Research for Abiotic Stress Tolerance written by Mirza Hasanuzzaman and published by Woodhead Publishing. This book was released on 2018-11-12 with total page 986 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Rice Research for Abiotic Stress Tolerance provides an important guide to recognizing, assessing and addressing the broad range of environmental factors that can inhibit rice yield. As a staple food for nearly half of the world’s population, and in light of projected population growth, improving and increasing rice yield is imperative. This book presents current research on abiotic stresses including extreme temperature variance, drought, hypoxia, salinity, heavy metal, nutrient deficiency and toxicity stresses. Going further, it identifies a variety of approaches to alleviate the damaging effects and improving the stress tolerance of rice. Advances in Rice Research for Abiotic Stress Tolerance provides an important reference for those ensuring optimal yields from this globally important food crop. Covers aspects of abiotic stress, from research, history, practical field problems faced by rice, and the possible remedies to the adverse effects of abiotic stresses Provides practical insights into a wide range of management and crop improvement practices Presents a valuable, single-volume sourcebook for rice scientists dealing with agronomy, physiology, molecular biology and biotechnology
Download or read book Nitrogen Use Efficiency and Sustainable Nitrogen Management in Crop Plants written by Nandula Raghuram and published by Frontiers Media SA. This book was released on 2022-04-26 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Accelerating Hybrid Rice Development written by and published by Int. Rice Res. Inst.. This book was released on with total page 709 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Agronomy written by Donald L. Sparks and published by Elsevier. This book was released on 2023-02-08 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Agronomy, Volume 178, the latest release in this leading reference on agronomy, contains a variety of updates and highlights new advances in the field, with each chapter written by an international board of authors. Includes numerous, timely, state-of-the-art reviews on the latest advancements in agronomy Features distinguished, well recognized authors from around the world Builds upon this venerable and iconic review series Covers the extensive variety and breadth of subject matter in the crop and soil sciences
