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Author: David Charles Whitehead
Publisher: Cabi
ISBN:
Category : Nature
Languages : en
Pages : 424
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Book Description
Grasses: Uptake of nitogen and effects on morphology and physiology; Legumes: biological nitogen fixation and interaction with grasses; Consumption, digestion and excretion of nitrogen by ruminant livestock; Amounts, sources and fractionation of organic nitrogen in soils; Mineralization, immobilization and availability of nitrogen in soils; Leaching of nitrogen from soils; Volatization of ammonia; Volatilization of gaseous nitrogen and nitrogen oxides through denitrification and nitrification; Use of fertilizer nitrogen and slurry nitrogen on grassland: recovery and response; Response to fertilizer nitrogen: influence of sward type, pattern of fertilizer application and method of harvesting; Response to fertilizer nitrogen: influence of weather, seasonal factors and soil type; Response to fertilizer nitrogen: influence of type of fertilizer and supplies of other nutrients; Influence of fertilizer nitrogen on the composition and nutritional quality of grassland herbage; Nitrogen balances in contrasting grassland systems.
Author: David Charles Whitehead
Publisher: Cabi
ISBN:
Category : Nature
Languages : en
Pages : 424
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Book Description
Grasses: Uptake of nitogen and effects on morphology and physiology; Legumes: biological nitogen fixation and interaction with grasses; Consumption, digestion and excretion of nitrogen by ruminant livestock; Amounts, sources and fractionation of organic nitrogen in soils; Mineralization, immobilization and availability of nitrogen in soils; Leaching of nitrogen from soils; Volatization of ammonia; Volatilization of gaseous nitrogen and nitrogen oxides through denitrification and nitrification; Use of fertilizer nitrogen and slurry nitrogen on grassland: recovery and response; Response to fertilizer nitrogen: influence of sward type, pattern of fertilizer application and method of harvesting; Response to fertilizer nitrogen: influence of weather, seasonal factors and soil type; Response to fertilizer nitrogen: influence of type of fertilizer and supplies of other nutrients; Influence of fertilizer nitrogen on the composition and nutritional quality of grassland herbage; Nitrogen balances in contrasting grassland systems.
Author: D. C. Whitehead
Publisher: CABI
ISBN: 9780851999388
Category : Medical
Languages : en
Pages : 392
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Book Description
This book is an essential reference source covering the chemical elements that are nutrients for plants or grazing animals. It deals with the concentrations and transformations of these elements in soils, grassland plants, and ruminant animals, particularly cattle and sheep. For each element, the following data are given: forms occurring in soil, factors that affect availability and concentration, uptake and distribution in grassland plants, role in animal nutrition, amounts and forms excreted by grazing animals, and concentrations needed by ruminant animals.
Author: S. C. Jarvis
Publisher: Oxford University Press, USA
ISBN:
Category : Nature
Languages : en
Pages : 468
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Book Description
This book examines the impact of gaseous nitrogen emissions from grasslands on atmospheric chemistry, acid rain, critical loads for ecosystems, climate change and ozone levels. The various stages of grassland production provide numerous opportunities for the escape of these environmentally active gases. These stages are examined and methods for controlling the emissions are explored. The interactions of the processes involved in the generation of these gases with other components of the overall nitrogen cycle are important and the chapters in this book look at these in terms of basic processes through to larger scale systems. The book brings together the leading workers in this area and provides an up-to-date account of the research along with implications for practice in this environmentally sensitive field. It is important reading for all grassland scientists, those involved in research into livestock production using grass and rangelands along with advisors to the farming community. It is also valuable for all those, such as ecologists and conservationists, concerned with pollution and the environment.
Author: H.G. van der Meer
Publisher: Springer Science & Business Media
ISBN: 9400943946
Category : Nature
Languages : en
Pages : 117
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Book Description
Author: L.F. Huenneke
Publisher: Springer Science & Business Media
ISBN: 9400931131
Category : Science
Languages : en
Pages : 224
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Book Description
The chapters in this volume are based on a opportumtles for studying the links between symposium, "California grasslands: structure abiotic and biotic components. and productivity", supported by the National The contributions in this volume illustrate Science Foundation. The primary objective of the links between population-level processes this symposium was to integrate the current and system-level phenomena in a well-studied understanding of controls on ecosystem struc community. Unfortunately, some areas of cur ture and function with the approaches of popu rent research (e.g., nutrient cycling) are under lation biology. The annual grasslands are represented in this volume. For other topics eminently suitable for experimental and manip (particularly the role of invertebrate con sumers), the lack of data from the annual grass ulative studies of ecosystem processes. The short lives and small stature of the component land brought a broader grassland perspective. plant species make experimental work far more Together, however, the contributions illustrate practical than in forests or even in perennial the importance of different ecological ap dominated prairies. The system's small-scale proaches in studying the controls on structure patchiness, and the obvious importance of and function of a complex system. the region's mediterranean climate in the life cycle of the annual vegetation, afford many L.F. Huenneke and H.A. Mooney Huenneke, L.F. and Mooney, H. (eds) Grassland Structure and Function: California Annual Grassland.
Author: David J. Gibson
Publisher: Oxford University Press
ISBN: 019852918X
Category : Nature
Languages : en
Pages : 323
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Book Description
This book is the most up to date and thorough account of the natural history of the plants that comprise the most important food crop on Earth, the grasses and grasslands.
Author: G. S. Innis
Publisher: Springer Science & Business Media
ISBN: 1461299292
Category : Science
Languages : en
Pages : 317
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Book Description
Perspectives on the ELM Model and Modeling Efforts This volume is the major open-literature description of a comprehensive, pioneering ecological modeling effort. The ELM model is one of the major outputs of the United States Grassland Biome study, a contribution to the International Biological Program (IBP). Writing this introduction provides wel come personal opportunity to (i) review briefly the state of the art at the beginning of the ELM modeling effort in 1971, (ii) to discuss some aspects of the ELM model's role in relation to other models and other phases of the Grassland Biome study, and (iii) to summarize the evolution of ELM or its components since 1973. Pre-Program Historical Perspective My first major contacts with ecological simulation modeling were in 1960 when I was studying intraseasonal herbage dynamics and nutrient production on foothill grasslands in southcentral Montana, making year-round measurements of the aboveground live vegetation, the standing dead, and the litter. Limitations in funding and the rockiness of the foothill soils prevented measuring the dynamics of the root biomass, both live and dead. Herbage biomass originates in live shoots from which it could be translocated into live roots or the live shoots could transfer to standing dead or to litter. Standing dead vegetation must end up in the litter and the live roots eventually transfer to dead roots. Obviously, the litter and the dead roots must decay away.
Author: C. J. Pearson
Publisher: Cambridge University Press
ISBN: 9780521568890
Category : Nature
Languages : en
Pages : 242
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Book Description
Revised edition, with an increased emphasis on systems, reflects current environmental and ethical concerns.
Author: David Charles Whitehead
Publisher: CABI Publishing
ISBN:
Category : Science
Languages : en
Pages : 224
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Book Description
Nitrogen transformations in grassland ecosystems. The nitrogen cycle and sources of nitrogen. Uptake and assimilation of nitrogen by grass. Symbiotic tixation by legumes. Transfer of symbiotically fixaed nitrogen to grass. Consumption of nitrogen by ruminants and its removal in livestock products. Return of nitrogen in animal excreta. Non-symbiotic nitrogen in soil organic matter. Release of mineral nitrogen from plant and animal residues and soil organic matter. Nitrification, and immobilization in non-exchangeable form, of ammonium nitrogen. Loss of nitrogen by leaching. Gaseous losses of nitrogen. The yield response of grass swards to fertilizer nitrogen.Effects of fertilizer nitrogen on composition and quality of herbage.
Author: D.A. McGilloway
Publisher: BRILL
ISBN: 9086865518
Category : Nature
Languages : en
Pages : 429
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Book Description
"The concept of grasslands as a global resource is not new. Indeed many recognised authorities have been canvassing for a global approach to understanding, managing and exploiting this resource for many years. This is the first book that gathers together leading experts from around the world to outline our current understanding of this complex ecosystem, the ways in which it can be enhanced and utilised and where the research challenges are for the future. The following themes unite the book: - Efficient production from grassland; - Grassland and the environment; - Delivering the benefits from grassland. The reader is given an in depth understanding of the biology of the system and how grasslands are crucial for soil stabilisation and water quality. Secondly, much attention is given to how grasslands offer the possibility of increasing food supply and income generation, which is a hugely important but often ignored facet in today’s climate of extensification and biodiversity. Current advances in the grassland sciences have a proven potential to promote the economic development and environmental stability of regions, nations and peoples, particularly in some of the most resource-limited areas of the world. Approaches for achieving the most effective development and adoption of new technology are reviewed."
