Download or read book The Role of Organic Matter in Modern Agriculture written by Y. Chen and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of organic residues as a means of maintaining and increasing soil fertility is of long-standing. This tradition has been somewhat neglected since the introduc tion of mineral fertilizers at low cost. More and more farmers and scientists are now showing renewed interest in the proper and effective use of org~tnic residues, composts and other recycled organic additives. The role and function of organic amendments in modern agricultural systems have become topics of major interest in the scientific and agricultural communities. Research work on residue disposal has provided new concepts on the interaction between organic components and soils as well as new handling technologies (e. g. pelletizing of organic residues). The trend to conserve energy has led scientists to study the minimal tillage system, to find ways of replacing conventional inorganic fertilizers with natural organic prod ucts or microbial preparations, and to develop new composting methods. The drive to achieve higher yields in commercial greenhouse farming has led to a search for optimum substrates as growth media and for improved management techniques. This has led to the introduction of organic substitutes for peat, nota bly those originating from agricultural wastes. Another important aspect is the current interest in organic farming, where use of synthetic chemicals is avoided or prohibited. An increasing percentage of the population in highly developed countries is willing to pay premium prices for food produced on soils where inorganic fertilizers and other agricultural chemicals have not been used.
Download or read book Phosphorus and Its Availability as Influenced by Organic Matter written by Philip John Westgate and published by . This book was released on 1940 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Availability of Soil Phosphorus as Influenced by Organic Matter and Organic Acid written by Daniel Owen Spinks and published by . This book was released on 1953 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cycles of Soils written by F. J. Stevenson and published by Wiley-Interscience. This book was released on 1986-01-17 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: The carbon cycle. Carbon balance of the soil and role of organic matter in soil fertility. Environmental aspects of the soil carbon cycle. The nitrogen cycle in soil: global and ecological aspects. The international cycle of nitrogen in soil. Impact of nitrogen on health and the environment. The phosporus cycle. The sulfur cycle. The micronutrient cycle.
Download or read book Legacy Phosphorus in Agriculture Role of Past Management and Perspectives for the Future written by Luke Gatiboni and published by Frontiers Media SA. This book was released on 2021-01-07 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soil Organic Matter Composition and Phosphorus Cycling in Temperate and Tropical Soils written by Andrew J. Margenot and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil organic matter (SOM) plays a key role in soil nutrient cycling strongly influenced by edaphic properties and management practices. This dissertation examines the role of SOM in nutrient cycling in two contrasting agroecosystems. The first section (Chapters 1-2) evaluates and applies a method for characterizing SOM in order to link its composition to organic nutrient pools in a temperate agroecosystem (California Central Valley organic tomato fields). The second section (Chapters 2-3) evaluates the organic component of P cycling in a tropical agroecosystem (western Kenya tillage and on-farm P fertilization trials). Chapter 1 reviews and assesses the utility of spectral subtractions in FTIR analysis of soil samples. This technique is increasingly applied for analysis of SOM, but the compositional complexity and mineral dominance of soil samples challenge SOM characterization. The use of spectral subtraction is an established technique for isolating SOM components of soil spectra. This review summarizes the history of subtractions in FTIR spectroscopy of soil samples, identifies and qualifies misconceptions and limitations on its use, and highlights trade-offs, recent developments, and future directions on the potential of spectral subtractions to improve and expand FTIR applications in soil science. Chapter 2 applies FTIR spectroscopy to link SOM functional group composition with organic C, N and P fractions in a northern California landscape exhibiting an SOM gradient. Significant differences in relative band intensities occurred among 13 organic tomato fields are identified, in particular a relative increase in absorbance of bands representing aliphatic C-H which positively associated with SOM content, and organic C and N fractions but not organic P fractions. Results implicate relative differences in organic functional groups with differences in total and labile SOM fractions. Additionally, this investigation identifies absorbance of infrared bands representing aliphatic C-H functional groups in these systems as a potential indicator of SOM transformations related to changes in its labile fractions. Chapter 3 examines a hypothesized benefit of conservation agriculture (CA) on soil P availability. The widespread promotion of CA in regions with weathered soils prone to P deficiency merits explicit consideration of its effect on P availability. Using a 9 year CA field trial located on an acid, weathered soil in western Kenya, reduced tillage and residue retention components of CA appeared to have limited effects on P availability. Residue management had no effect on soil P, but reduced tillage increased soil aggregation and labile soil P stocks. Relatively low soil available P across treatments suggests that CA with recommended P fertilization may not be an optimal P management strategy for weathered soils in this region. Chapter 4 investigates two commonly employed P fertilizers for potentially differing influences on organic P cycling. Using a long-term, on-farm trial in western Kenya, regionally available Minjingu phosphate rock (MPR) and triple super phosphate (TSP) are assessed for their effects on microbial and enzymatic components of organic P cycling. In this weathered soil, the form of P fertilizer has a significant impact on P cycling, with enhanced activity of P-cycling enzymes and greater microbial biomass P under MPR compared to TSP.
Download or read book Organic Phosphorus in the Environment written by Benjamin L. Turner and published by Cabi. This book was released on 2005 with total page 399 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phosphorus is essential for life, yet is often the element most limiting for biological productivity. Although most organisms take up phosphorus in an inorganic form, organic forms frequently dominate in soils and aquatic systems. Up to this point, the role of organic phosphorus and mechanisms for its dynamics have been poorly understood. However, recent advances in research have shed new light on the subject and this book brings together these advances. It covers the transformation and characterization of organic phosphorus in both terrestrial and aquatic systems. It will attract a broad range of scientists from several disciplines.
Download or read book Microorganisms in Soils Roles in Genesis and Functions written by Francois Buscot and published by Springer Science & Business Media. This book was released on 2007-01-04 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: For this third volume of the series Soil Biology, internationally renowned scientists shed light on the significant roles of microbes in soil. Key topics covered include: bioerosion, humification, mineralization and soil aggregation; Interactions in the mycorrhizosphere; microbes and plant nutrient cycling; Microbes in soil surface or toxic metal polluted soils; Use of marker genes and isotopes in soil microbiology, and many more.
Download or read book Availability of Phosphorus in Organic Amendments as Affected by Soil Temperature written by James LeRoy Abbott and published by . This book was released on 1965 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soil and Water Chemistry written by Michael E. Essington and published by CRC Press. This book was released on 2015-04-24 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition of a bestseller, Soil and Water Chemistry: An Integrative Approach maintains the balanced perspective that made the first edition a hugely popular textbook. The second edition includes new figures and tables, new chapters, and expanded exercises in each chapter. It covers topics including soil chemical environment, soil minerals,
Download or read book Chemical Processes in Soils written by M. A. Tabatabai and published by . This book was released on 2005 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Phosphate Fixation in Soils written by Jesse Lowell Doughty and published by . This book was released on 1934 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Availability to plants of nitrogen and phosphorus in soil as influenced by organic matter with special reference to green manures written by Vijal Pal Singh and published by . This book was released on 1957 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Building Soils for Better Crops written by Fred Magdoff and published by Sare. This book was released on 2009 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: "'Published by the Sustainable Agriculture Research and Education (SARE) program, with funding from the National Institute of Food and Agriculture, U.S. Department of Agriculture."
Download or read book Organic Matter and Rice written by and published by Int. Rice Res. Inst.. This book was released on 1984 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Forms and Fractions of Organic Phosphorus in Soils and Availability as Effected by Liming written by William Baynard Boykin and published by . This book was released on 1953 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Decomposition of Organic Matter as Influenced by Different Sources of Phosphorus and Its Effect on Crop Growth written by Chaudhari C G. and published by . This book was released on 1975 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:
