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Charge Characteristics Of Soils From The Coastal Region Of Pernambuco Brazil
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Book Synopsis Charge Characteristics of Soils from the Coastal Region of Pernambuco, Brazil by : Antonio Fernando Magalhães
Download or read book Charge Characteristics of Soils from the Coastal Region of Pernambuco, Brazil written by Antonio Fernando Magalhães and published by . This book was released on 1979 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Charge Characteristics Sof Soils from the Coasstal Region of Pernambuco (Brazil). by : A.F. Magalhaes
Download or read book Charge Characteristics Sof Soils from the Coasstal Region of Pernambuco (Brazil). written by A.F. Magalhaes and published by . This book was released on 1979 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this research were to evaluate the available methods to measure the charge characteristics of tropical soilis from the coastal region of Pernambuco State in Brazil, and to determine the relationships between measured charges and mineralogical properties of the soils. the feasibililty of utilizing an equilibrium ton exchange technique in conjunction with ion-selective electrodes to measure charge characteristics of tropical soils was also evaluated. Samples from A and B horizons of three red yellow Latosols, three red yellow Podzolics, two "Terra roxas " and one reddish Brunizen were collected. They were c?haracterized through chemical and X-ray difractometry ananysis. The surface change properties of these soils were detrmined by the potentiometric titration and ion adsorption (Schofield) methods. An equilibrium-adsorption method to measure charge based on the adsorption of NH4+ and Cl- b the soils from a dilute NH4Cl solution was developed and tested. Mineralogical studies revealed that kaolinite was the dominant mineral in the clay fraction of most soils. Quartz was the predominant mineral in the silt and sand fractions of the Latosol and Podzolic soils. With the exception of the reddish Bruniozen, when the charge characteristics of the soils were measured by potentiometric titration and the ion adsorption technique (Schofield method) all soilsl behaved as variable charge types. It appears that the surface change of these soils lmay be described by the constant potential surface model. The ZPC values determined by potentiometric titration ranged from 2.2 to 4.6. The ZPC values measured by the Schofield method ranged from 0.5 to 4.5. Only f?ive soil samples were observed t o behave as variably charged adsorption method. No agreement was found among the ZPC values determined by the three methods used. The ighest values were measured by the potent ionametric method and the lowest b?ly the eqauilibrium-adsorption method. The surface charge measurements by experimental techniques were found to be highly dependente on the method employed inn their determination.
Book Synopsis A Reference Guide to Latin America and the Caribbean by : University Microfilms International
Download or read book A Reference Guide to Latin America and the Caribbean written by University Microfilms International and published by . This book was released on 1988 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bibliography and Index of Geology by :
Download or read book Bibliography and Index of Geology written by and published by . This book was released on 1991 with total page 1504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Charge Characteristics and Ion Exchange Equilibria in Soils from the Humid Tropics of Brasil by : Francisco Ilton de Oliveira Morais
Download or read book Charge Characteristics and Ion Exchange Equilibria in Soils from the Humid Tropics of Brasil written by Francisco Ilton de Oliveira Morais and published by . This book was released on 1975 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of the distribution of electric charges in the A and B horizons of some Oxisols, Alfisols and a Mollisol from Brasil was made by direct measurement of retention of ions in the presence of varying electrolyte concentration. Sample of an Oxisol, Ultisol, and an Alfisol were also used for ion-exchange studies by means of a saturation-displacement procedure. With the exception of the Mollisol, where the surface potential could be visualized as being of the variable type, the electrochemical behavior of the soils was found to be similar to that of the constant potential systens ub which the surface potential is determined by H+ and oH- ions in the equilibrium solution; hence charge distribution varied substantially with pH and electrolyte concentration. The concentration effect was not as pronounced as the pH effect and in some cases was not statistically significant. Direct measurement of adsorption of ions from MgSO4, MgC12, K2SO4, KC1, and Nac1 showed that the nature and valence of the counter ion also influenced the magnitude of the eletric charges on the soil particles. However, with respect to K the changes in charge were due to anion effects not cation effects, suggesting a strong affinity of K for the soil materials. The ZPC of the soils determined by plotting the net charges against pH varied from 1.2 to 3.4 in the A horizons and from 4.0 to 6.1 in the B horizons. lThe surface horizons of the soils were, in general, net negatively charged at or near their field pH. This fact was found to be ...
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1980 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comprehensive Dissertation Index by :
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1984 with total page 1086 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. for 1973- include the following subject areas: Biological sciences, Agriculture, Chemistry, Environmental sciences, Health sciences, Engineering, Mathematics and statistics, Earth sciences, Physics, Education, Psychology, Sociology, Anthropology, History, Law & political science, Business & economics, Geography & regional planning, Language & literature, Fine arts, Library & information science, Mass communications, Music, Philosophy and Religion.
Book Synopsis American Doctoral Dissertations by :
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1979 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agronomy News written by and published by . This book was released on 1978 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sept.-Oct. issue includes list of theses and dissertations for U.S. and Canadian graduate degrees granted in crop science, soil science, and agronomic science during the previous academic year.
Download or read book Soils and Fertilizers written by and published by . This book was released on 1998-07 with total page 1294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comprehensive Dissertation Index: Agriculture by :
Download or read book Comprehensive Dissertation Index: Agriculture written by and published by . This book was released on 1984 with total page 1080 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Properties and Management of Soils in the Tropics by : Pedro A. Sanchez
Download or read book Properties and Management of Soils in the Tropics written by Pedro A. Sanchez and published by Cambridge University Press. This book was released on 2019-01-10 with total page 685 pages. Available in PDF, EPUB and Kindle. Book excerpt: Long-awaited second edition of classic textbook, brought completely up to date, for courses on tropical soils, and reference for scientists and professionals.
Download or read book Agronomy Abstracts written by and published by . This book was released on 1990 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes abstracts of the annual meetings of the American Society of Agronomy; Soil Science Society of America; Crop Science Society of America ( - of its Agronomic Education Division).
Download or read book Agrindex written by and published by . This book was released on 1994 with total page 992 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Atlantic Forest by : Marcia C. M. Marques
Download or read book The Atlantic Forest written by Marcia C. M. Marques and published by Springer Nature. This book was released on 2021-01-13 with total page 527 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Atlantic Forest is one of the 36 hotspots for biodiversity conservation worldwide. It is a unique, large biome (more than 3000 km in latitude; 2500 in longitude), marked by high biodiversity, high degree of endemic species and, at the same time, extremely threatened. Approximately 70% of the Brazilian population lives in the area of this biome, which makes the conflict between biodiversity conservation and the sustainability of the human population a relevant issue. This book aims to cover: 1) the historical characterization and geographic variation of the biome; 2) the distribution of the diversity of some relevant taxa; 3) the main threats to biodiversity, and 4) possible opportunities to ensure the biodiversity conservation, and the economic and social sustainability. Also, it is hoped that this book can be useful for those involved in the development of public policies aimed at the conservation of this important global biome.
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1990 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Cerrados of Brazil by : Paulo S.
Download or read book The Cerrados of Brazil written by Paulo S. and published by Columbia University Press. This book was released on 2013-02-05 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: The massive grasslands of Brazil -- known as the cerrados -- which cover roughly a quarter of its land surface and are among the most threatened regions in South America, have received little media attention. This book brings together leading researchers on the area to produce the first detailed account in English of the natural history and ecology of the cerrado/savanna ecosystem. Given their extent and threatened status, the richness of their flora and fauna, and the lack of familiarity with their unique ecology at the international level, the cerrados are badly in need of this important and timely work.
