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Sorption And Desorption Of Ortho Phosphate From Reference And Soil Clay As Influenced By Chemical Factors Existent Near Plant Roots
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Book Synopsis Sorption and Desorption of Ortho-phosphate from Reference and Soil Clay as Influenced by Chemical Factors Existent Near Plant Roots by : Uzi Kafkafi
Download or read book Sorption and Desorption of Ortho-phosphate from Reference and Soil Clay as Influenced by Chemical Factors Existent Near Plant Roots written by Uzi Kafkafi and published by . This book was released on 1987 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States-Israel Binational Agricultural Research and Development Fund Publisher : ISBN 13 : Total Pages :706 pages Book Rating :4.:/5 (319 download)
Book Synopsis Annual Scientific Report by : United States-Israel Binational Agricultural Research and Development Fund
Download or read book Annual Scientific Report written by United States-Israel Binational Agricultural Research and Development Fund and published by . This book was released on 1989 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States-Israel Binational Agricultural Research and Development Fund Publisher : ISBN 13 : Total Pages :116 pages Book Rating :4.3/5 (129 download)
Book Synopsis BARD Agricultural Research Projects by : United States-Israel Binational Agricultural Research and Development Fund
Download or read book BARD Agricultural Research Projects written by United States-Israel Binational Agricultural Research and Development Fund and published by . This book was released on 1983 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Sorption and Desorption of Phosphorus as Influenced by Corn Stalk Residue, PH, and Ionic Strength in a Gleysol from Québec, Canada by : Mariam Sorour
Download or read book Sorption and Desorption of Phosphorus as Influenced by Corn Stalk Residue, PH, and Ionic Strength in a Gleysol from Québec, Canada written by Mariam Sorour and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Pike River watershed has a history of phosphorus (P) pollution due to surface and subsurface leaching, and erosion of agricultural soil rich in P. It is therefore important to consider factors that may change the dynamics of P sorption and desorption behaviours and potentially increase the P concentration in the soil solution. This thesis investigates the effect of corn stalk residue presence and application rate on P sorption and desorption. This thesis also investigates the effect of varying solution pH and ionic strength on P release. Batch experiments were used to investigate P sorption followed by experiments to test the reversibility of the sorption process under different corn stalk residue applications (0.3,5.3,10.3,15.3, and 20.3%) and at different P concentrations (0, 12.9, 27.7, 42.2, 57.0, and 71.8 mg L-1). The quantity of P sorbed to soil was found to decrease significantly as residue application rates increased (p
Book Synopsis The Dynamics of Phosphorus Extractability, Adsorption, and Desorption Rates as Influenced by Phosphorus Applications and Incubation Times by : Victor Akangah Ochwoh
Download or read book The Dynamics of Phosphorus Extractability, Adsorption, and Desorption Rates as Influenced by Phosphorus Applications and Incubation Times written by Victor Akangah Ochwoh and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In a study to investigate the fate of the applied P in soils, a red-sandy clayey soil (Ferric Luvisols) from Rustenburg (high P fixing) and a red-sandy loam soil (Ferric Acrisols) from Loskop (low P fixing) were used. Sequential P fractionations were used to determine the content of the different P pools to show which pool the applied P was transformed to. The soils treatments consisted of different Prates (0, 25, 50, 100, 150, and 200 mg kg-1), and incubation periods (1, 60, 120, 180, and 240 days) under a laboratory conditions. The sequential P fractionation procedure consisted of extraction with hydrous ferric oxide in a dialysis membrane tube (DMT-HFO), 0.5M NaHC03, O.1M NaOH-P, 1.0M HCI, concentrated HCI, and concentrated H2S04 + H2O2. Approximately 30 to 60 % of the added P were transformed into less labile P pools within one day and 80-90 % after 60 days. This transformation was faster in the Rustenburg than in the Loskop soil showing a higher P fixation capacity. A major part of the P transformation was to the -OH-P1 pool with a recovery of about 30%. In the second experiment an attempt was made to determine P desorption rates by successive DMT-HFO extractions (1, 7, 14, 28, and 56 days) after the transformations of the applied P. This was followed by the sequential extractions to determine the changes and distribution of the added P into different P pools as well as which pools the P was des orbed from. The Rustenburg and Loskop soils were treated to different Prates (0, 25, 50, 100, and 200 mg P kg-1) and incubation periods (1, 120, and 240 days). The cumulative DMT -HFO extraction curves for 56 days showed that desorption could continue for a much longer period. This property is important in the economical management of fertilizer applications rates. Results showed the transformations and distribution of the applied P during incubation periods and proved that all the stable soil P pools contributed to the labile P pool by different proportions after prolonged successive DMT-HFO extractions. Although Rustenburg soil is considered a high P fixing soil, the P release rates under laboratory conditions were high enough to meet the requirements of cotton and tobacco crops. Root systems of these crops do not exploit 100 % soil volume as this laboratory method, which could explain why these crops experience P deficiencies. It is envisage that by using this method the P releasing properties of a soil could be used to develop a P desorption model to determine how much extractable P, with a specific extractant, in a particular soil, should be available at the beginning of a growing season to sustain a high enough P releasing rate to meet the requirements of a certain crop up to the end of the growing season. To do this, a model to describe root development that represents the percentage of the soil exploited P desorption rates that simulate P uptake by plant roots will be necessary.
Book Synopsis On the Chemistry of Soil Phosphate and the Supply of Phosphate to Plants by : Keith Ronald Helyar
Download or read book On the Chemistry of Soil Phosphate and the Supply of Phosphate to Plants written by Keith Ronald Helyar and published by . This book was released on 1973 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Chemical Processes in Soils by : M. A. Tabatabai
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:
Book Synopsis Phosphate Sorption and Desorption Characteristics in Soil Systems Determined with a Polynuclear-Al-saturated Cation Exchange Resin by : Yingming Liang
Download or read book Phosphate Sorption and Desorption Characteristics in Soil Systems Determined with a Polynuclear-Al-saturated Cation Exchange Resin written by Yingming Liang and published by . This book was released on 1988 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Phosphate Sorption and Desorption Study on an Acid Sandy Clay Soil by : Pieter Christiaan De Jager
Download or read book A Phosphate Sorption and Desorption Study on an Acid Sandy Clay Soil written by Pieter Christiaan De Jager and published by . This book was released on 2002 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Role of Organic Matter in Modern Agriculture by : Y. Chen
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.
Book Synopsis Sorption and Desorption of Inorganic Phosphate by Soils as Influenced by Inorganic and Organic Anions by : Keith David Earl
Download or read book Sorption and Desorption of Inorganic Phosphate by Soils as Influenced by Inorganic and Organic Anions written by Keith David Earl and published by . This book was released on 1975 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Adsorption-desorption of Pyrophosphate and Orthophosphate, and Pyrophosphate Hydrolysis in Soils, Goethite, and Silicate Clay Minerals by : Thamir Sadoon H. Al-Kanani
Download or read book Adsorption-desorption of Pyrophosphate and Orthophosphate, and Pyrophosphate Hydrolysis in Soils, Goethite, and Silicate Clay Minerals written by Thamir Sadoon H. Al-Kanani and published by . This book was released on 1984 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Hydrolysis and adsorption-desorption reaction of pyrophosphate (PP) and orthophosphate (OP) were studied in two Quebec soils (St. Bernard and Dalhousie) and three minerals (goethite, kaolinite, and montmorillonite). Soil and soil mineral samples were fractionated by size into two separates." --
Book Synopsis Bioavailability of Contaminants in Soils and Sediments by : National Research Council
Download or read book Bioavailability of Contaminants in Soils and Sediments written by National Research Council and published by National Academies Press. This book was released on 2003-05-03 with total page 433 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bioavailability refers to the extent to which humans and ecological receptors are exposed to contaminants in soil or sediment. The concept of bioavailability has recently piqued the interest of the hazardous waste industry as an important consideration in deciding how much waste to clean up. The rationale is that if contaminants in soil and sediment are not bioavailable, then more contaminant mass can be left in place without creating additional risk. A new NRC report notes that the potential for the consideration of bioavailability to influence decision-making is greatest where certain chemical, environmental, and regulatory factors align. The current use of bioavailability in risk assessment and hazardous waste cleanup regulations is demystified, and acceptable tools and models for bioavailability assessment are discussed and ranked according to seven criteria. Finally, the intimate link between bioavailability and bioremediation is explored. The report concludes with suggestions for moving bioavailability forward in the regulatory arena for both soil and sediment cleanup.
Book Synopsis Phosphate Availability in the Soil-root System by : Jannetje Susanna Geelhoed
Download or read book Phosphate Availability in the Soil-root System written by Jannetje Susanna Geelhoed and published by . This book was released on 1998 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Processes and Factors Affecting Phosphorus Sorption in Soils by : Samuel Asomaning
Download or read book Processes and Factors Affecting Phosphorus Sorption in Soils written by Samuel Asomaning and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The subject of this chapter is soil chemistry. The chapter is entitled Processes and Factors Affecting Phosphorus (P) Adsorption in Soils. The chapter aims to give an overview of the major mechanisms responsible for phosphate sorption (i.e., adsorption and absorption of phosphate) in soils, particularly of acid soils. According to studies conducted by some soil scientists, the major soil factors affecting P sorption are time, soil pH, soil organic matter, and iron and aluminium oxides of soils. Studies conducted indicated that adsorption of the P increases as the P ages in the soil. Soil pH affects phosphate adsorption but the effect is limited for adsorption by soils in the pH range of 4,Äì8. Organic matter may affect P adsorption in two ways: indirectly by inhibiting iron oxide crystallisation and directly by competing for adsorption sites. On per mole basis, oxalate extractable aluminium oxides adsorb nearly twice as much P as oxalate extractable iron oxides due to poorer crystallinity (higher specific area) of the aluminium oxides compared to the iron oxides and also to a higher charge of the former. The chapter also highlights the pedotransfer functions (PTFs) of Borggaard, which can be used to calculate for the P adsorption in highly weathered acid soils.
Book Synopsis Cycles of Soils by : F. J. Stevenson
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.
Book Synopsis Phosphorus Sorption, Desorption and Availability in Oxisols and Ultisols as Influenced by Soil Aggregate Size by : Xinmin Wang
Download or read book Phosphorus Sorption, Desorption and Availability in Oxisols and Ultisols as Influenced by Soil Aggregate Size written by Xinmin Wang and published by . This book was released on 1997 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
