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Author : Australian Academy of Science
Publisher : Unknown
Page : 200 pages
File Size : 52,8 Mb
Release : 1981
Category : Electronic
ISBN : OCLC:621873085
Author : Robert Wetselaar,Jeffrey Randal Simpson,Thomas Rosswall
Publisher : Unknown
Page : 232 pages
File Size : 53,7 Mb
Release : 1981
Category : Science
ISBN : CORNELL:31924003681065
Rice; Plantation systems; Natural communities; Legumes & casuarina; Environmental problems; Modelling & methodology; Rainwater; Work group reports; Authors & participants.
Author : Y.R. Dommergues,G.H. Diem
Publisher : Springer Science & Business Media
Page : 329 pages
File Size : 50,5 Mb
Release : 2012-12-06
Category : Nature
ISBN : 9789400975293
It is an established fact that we must continually increase and improve agricultural production if we are to meet even the minimum requirements of a growing popu lation for food, shelter, and fuel. In recent years, the introduction of new plant varieties and the extensive use of fertilizers have effectively increased crop yields, but intensifying agricultural methods has often led to depleting soil fertility. Two examples of the harmful consequences of intensive farming practices are the loss of up to 2.5 cm of topsoil every 15 years in the United States through erosion and the alarming rise in environmental pollution through widespread use of pesticides. Countless other processes affecting the activity of soil micro flora and the inter actions between microorganisms and plants may pose an equal danger to soil equilibrium, but their potential hazards are often overlooked because of an insufficient understanding of soil microbiology on the part of scientists. In the first published study of its kind, the authors of this book have attempted to address major aspects of the microbial activity of soil in the tropics. Tropical conditions serve as an ideal context for a discussion of soil microbiology, since biological processes in the soil are particularly active in tropical environments in comparison to other settings and in relation to physical and chemical processes.
Author : G. Philip Robertson,R. Herrera,T. Rosswall
Publisher : Springer Science & Business Media
Page : 414 pages
File Size : 52,8 Mb
Release : 2012-12-06
Category : Science
ISBN : 9789400976399
The large and rapidly expanding body ofliterature related to nitrogen cycling in both managed and native terrestrial ecosystems reflects the importance accorded to the behaviour of this vital and often limiting nutrient. Research at the organism, ecosystem and landscape levels commonly addresses questions concerning nitrogen acquisition, internal cycling and retention. Goals for this research include increased agricultural productivity and a better understanding of human impact on local, regional and global nitrogen cycles. Nitrogen cycle research in tropical regions has a long and distinguished history. Research on different aspects of nitrogen cycling in ecosystems of the tropics has been carried out in many regions. In relatively few instances has there, however, been a focus on the biogeochemical cycles at the ecosystem level. The meeting resulting in this volume was an attempt to bring together existing information on nitrogen cycling in ecosystems of Latin America and the Caribbean and discuss this in an ecosystem context.
Author : N. S. Subba Rao
Publisher : Cambridge University Press
Page : 376 pages
File Size : 47,5 Mb
Release : 1984
Category : Science
ISBN : 0521417538
This volume discusses the most recent advances in biological nitrogen fixation, with chapters written by experts on the ecology, physiology, biochemistry and genetics of biological nitrogen fixation.
Author : International Network on Soil Fertility and Fertilizer Evaluation for Rice. Meeting,International Rice Research Institute
Publisher : Int. Rice Res. Inst.
Page : 267 pages
File Size : 49,6 Mb
Release : 1987
Category : Technology & Engineering
ISBN : 9789711041748
Author : Zhu Zhao-liang,Wen Qi-xiao,J.R. Freney
Publisher : Springer Science & Business Media
Page : 344 pages
File Size : 40,9 Mb
Release : 2012-12-06
Category : Science
ISBN : 9789401156363
The study of soil nitrogen has long been an active field, but it was generally pivoted on agricultural and forestry production, and animal husbandry. With the rapid increase in the use of fertilizer nitrogen, more attention has been paid to the rela tionship between nitrogen management and environmental quality and human of soil nitrogen has become more comprehensive with health. In addition, the study the development of related sciences. The quantitative study of the processes in nitrogen cycling and their interrelationships has been an important part of this project and has attracted the attention of scientists allover the world. Nitrogen is one of the most important nutrients for plant growth and the applica tion of fertilizer nitrogen is playing an important role in agricultural production. The annual consumption of fertilizer nitrogen in the world has reached 70 million tons, and China has an annual consumption of more than 15 million tons and is the largest fertilizer nitrogen consumer in the world. However, the efficiency of nitro gen fertilizer is low and losses are large. It is estimated that nitrogen losses from agriculture in our country can be as high as 40-60% of the nitrogen applied. Some of the lost nitrogen enters the atmosphere and contributes to the greenhouse effect and some enters water bodies to pollute the water.
Author : Singh J.S., Singh S.P. & Gupta S.R.
Publisher : S. Chand Publishing
Page : 929 pages
File Size : 51,5 Mb
Release : 2014
Category : Science
ISBN : 9789383746002
Over the years, the scope of our scientific understanding and technical skills in ecology and environmental science have widened significantly, with increasingly greater emphasis on societal issues. In this book, an attempt has been made to give basic concepts of ecology, environmental science and various aspects of natural resource conservation. The topics covered primarily deal with environmental factors affecting organisms, adaptations, biogeography, ecology of species populations and species interactions, biotic communities and ecosystems, environmental pollution, stresses caused by toxics, global environmental change, exotic species invasion, conservation of biodiversity, ecological restoration, impact assessment, application of remote sensing and geographical information system for analysis and management of natural resources, and approaches of ecological economics. The main issues have been discussed within the framework of sustainability, considering humans as part of ecosystems, and recognising that sustainable development requires integration of ecology with social sciences for policy formulation and implementation.
Author : Pierre A. Roger
Publisher : Int. Rice Res. Inst.
Page : 269 pages
File Size : 53,9 Mb
Release : 1996
Category : Flood-Rice field
ISBN : 9789712200687
Author : Rainer Schultze-Kraft,R. J. Clements
Publisher : CIAT
Page : 680 pages
File Size : 51,9 Mb
Release : 1990
Category : Technology & Engineering
ISBN : 9589183123
Author : J.R. Freney,J.R. Simpson
Publisher : Springer Science & Business Media
Page : 325 pages
File Size : 55,5 Mb
Release : 2013-04-17
Category : Science
ISBN : 9789401716628
A growing interest has been shown recently in the dymanics of nitrogen in agricultural and natural ecosystems. This has been caused by increasing demands for food and fibre by a rapidly expanding world population, and by a growing concern that increased land clearing, cultivation and use of both fertilizer and biologically fixed nitrogen can have detrimental effects on the environment. These include effects on water quality, eutrophication of surface waters and changes in atmospheric composition all caused by increased cycling of nitrogenous compounds. The input and availability of nitrogen frequently affects the productivity of farming systems more than any other single management factor, but often the nitrogen is used inefficiently. Much of the fertilizer nitrogen applied to the soil is not utilised by the crop: it is lost either in solution form, by leaching of nitrate, or in gaseous forms as ammonia, nitrous oxide, nitric oxide or dinitrogen. The leached nitrate can contaminate rivers and ground waters, while the emitted ammonia can contaminate surface waters or combine with atmospheric sulfur dioxide to form aerosols which affect visibility, health and climate. There is also concern that increased evolution of nitrous oxide will deplete the protective ozone layer of the stratosphere. The possibility of a link between the intensity of agricultural use of nitrogen, nitrous oxide emissions and amounts of stratospheric ozone has focussed attention on these interactions.
Author : Paul Sillitoe
Publisher : Routledge
Page : 465 pages
File Size : 47,7 Mb
Release : 2013-10-31
Category : Social Science
ISBN : 9781134377466
A Place Against Time is an ethnographically focused environmental study of Montane, New Guinea, where people were among the world's first to cultivate crops some ten millennia ago, and where today an enduring agricultural condition continues. It arranges its account of climate, vegetation topography and geology according to their relationship with the soils of the region occupied by Wola speakers in the Southern Highlands Province of Papua New Guinea, in the Western Pacific. This book breaks new intellectual ground as an ethno-environmental investigation with a soils perspective, ethno-pedology being a little researched topic to date.
Author : P. Uomala
Publisher : Springer Science & Business Media
Page : 460 pages
File Size : 55,9 Mb
Release : 2012-12-06
Category : Science
ISBN : 9789400943780
Biological fixation of nitrogen by organisms and associations other than those concerned in the legume-Rhizobium symbiosis has attracted increasing attention since the firstintemationalworkshop on the theme at Piracicaba, Brasil, in 1979. Approximately 150 scientists gathered on September 2-8, 1984, at the Hanasaari Cultural Centre near Helsinki, Finland, for the third international meeting on nitrogen fixation with non-legumes. Forty-two papers and 39 posters were presented; 32 of the papers have been broughttogetherin this publication. The Symposium was generously sponsored by the FinnishNational Fund for Research and Development (SITRA) in connection with a large project on biological nitrogenfixation and utilization ofnitrogen extending from 1980 to 1985. The Symposium was organized jointly by SITRA, which dealt with all practical matters very efficiently and with impressive concern for the welfare of the participants, and Societas Biochemica, Biophysica et Microbiologica Fenniae, the society of Finnish microbiologists, which made valuable contributions on scientific matters. As in the previous symposium at Banff, Canada, in 1982 the programme did not involve parallel sessions~ all participants had the opportunity of listening to all presentations. Consequently, the FIN- NIF Symposium profited from a steady audience and the consistency this gave to the discussions. In view of the growing interest in N-fixation with non-legumes and the continuous broadening of the field, such an arrangement may not be possible in the future. I thank all participants for their contributionsto both oral sessions and poster presentations, and hope that this publication will become a frequently quoted source of knowledge.
Author : Anonim
Publisher : Int. Rice Res. Inst.
Page : 561 pages
File Size : 44,7 Mb
Release : 1982
Category : Rice
ISBN : 9789711040611
Author : Vasant Gowariker,V. N. Krishnamurthy,Sudha Gowariker,Manik Dhanorkar,Kalyani Paranjape
Publisher : John Wiley & Sons
Page : 880 pages
File Size : 51,6 Mb
Release : 2009-04-08
Category : Technology & Engineering
ISBN : 0470431768
Fertilizers are key for meeting the world s demands for food, fiber, and fuel. Featuring nearly 4,500 terms of interest to all scientists and researchers dealing with fertilizers, The Fertilizer Encyclopedia compiles a wealth of information on the chemical composition of fertilizers, and includes information on everything from manufacturing and applications to economical and environmental considerations. It covers behavior in soil, chemical and physical characteristics, physiological role in plant growth and soil fertility, and more. This is the definitive, up-to-date reference on fertilizers. This book is not available for purchase from Wiley in the country of India. Customers in India should visit Vasudha Research & Publications Pvt. Ltd. at www.fertilizer-encyclopedia.com
