Liming Of Highly Weathered Soils Of The Humid Tropics
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Liming of Highly Weathered Soils of the Humid Tropics by Gaston Amedee Pdf
The object of this investigation was to evaluate two commonly used laboratory methods for determining the "lime-requirement" of highly weathered acid soils of the humid tropics and to study the fate of CaCO3 applied to these soils. The standard of comparison for the lime-requirement was the maximum amount of CaCO3 decomposed by the soils upon equilibration of the soils with an excess of CaCO3 and the partial pressure of CO2 of the air. The two common laboratory methods for determining the lime-requirement of soils examined in the present study were the sal (1N KCl) extractable acidity and the exchange acidity as determined by the BaCl2-triethanolamine (TEA) method. The soil samples used fromin this study comproside the Ap and B2 horizons of highly-weathered soils from seven different locations in Brazil, Colombia, and Puerto Rico, known to represent extensive areas of potentially productiove agricultural soils.
United States. Agency for International Development. Bureau for Technical Assistance
Author : United States. Agency for International Development. Bureau for Technical Assistance Publisher : Unknown Page : 458 pages File Size : 55,9 Mb Release : 1976 Category : Agricultural assistance, American ISBN : CORNELL:31924001317746
Catalogue of Research Literature for Development: Food production and nutrition by United States. Agency for International Development. Bureau for Technical Assistance Pdf
United States. Agency for International Development. Bureau for Technical Assistance
Author : United States. Agency for International Development. Bureau for Technical Assistance Publisher : Unknown Page : 612 pages File Size : 44,5 Mb Release : 1976 Category : Developing countries ISBN : CORNELL:31924055006187
Catalogue of Research Literature for Development: Food production and nutrition, development and economics, education and human resources, health, selected development areas by United States. Agency for International Development. Bureau for Technical Assistance Pdf
Plant-Soil Interactions at Low pH by Robert J. Wright,V.C. Baligar,R. Paul Murrmann Pdf
Soil acidity is a major limitation to crop production in many parts of the world. Plant growth inhibition results from a combination of factors, including aluminum, manganese, and hydrogen ion toxicities and deficiencies of essential elements, particularly calcium, magnesium, phosphorus, and molybdenum. Agricultural management practices and acid precipitation have increased acid inputs into the ecosystem and heightened concern about soil acidity problems. While application of lime has proved to be effective in ameliorating surface soil acidity in many areas, significant soil acidity problems still exist. Scientists from Alberta, Canada, recognized the need to provide a forum for researchers from different disciplines to exchange information and ideas on solving problems of plant growth in acid soils. As a result of their efforts, the First International Symposium on Plant-Soil Interactions at Low pH was held at Grande Prairie, Alberta, Canada, in July 1987. In many acid soil areas, liming materials are not readily available, the cost may be prohibitive, or subsoil acidity cannot be corrected by surface application of lime. New management approaches involving both the plant and the soil are needed in these situations. Progress has been made in the selection and breeding of acid-tolerant plants. However, continued progress will be limited by our lack of understanding of the physiological and biochemical basis of differential acidity tolerance among plants.
Characterization of Soils in Relation to Their Classification and Management for Crop Production by D. J. Greenland Pdf
Soils and crop production in the lowland humid tropics; Representative toposenquences of soils in southern Nigeria and their pedology; Mineralogy; Chemical characteristics; Degree of weathering and surface properties of clays; Phosphorus sorption and release; Physical properties; Micronutrient status; Microbiological factors; Management of the soils for continuous production: controlling erosion and maintaining physical condition; Management of the soils for continuous productions: controlling nutrient status; Soil management in the Oxisol savannahs and Ultisol jungles of tropical South America; Soil fertility-capacibility assessment for use in the humid tropics; Climates of the tropics in relation to crop productivity; Farming systems and crops of the humid tropics in relation to soil utilization; Appendix 1: profile locations, descriptions, and analyses; Appendix 2: farming systems and crops of the humid tropics of West Africa.
Land-Use Change Impacts on Soil Processes by Francis Q Brearley,Andrew D Thomas Pdf
This book examines the effects that land-use changes (notably agricultural intensification, logging, soil erosion, urbanisation and mining) have on soil characteristics and processes in tropical and savannah environments. It covers a range of geographical regions and environments as impacts of land use change are often site specific. The effects of land use change on various aspects of the soil ecosystem from both a chemical and biological perspective will be examined.
Ecophysiology of Tropical Crops by Paulo de T. Alvim,T. T. Kozlowski Pdf
Ecophysiology of Tropical Crops covers the knowledge and opinion on ecophysiology of the major tropical crop plants. The book discusses the fundamental ideas about the numerical description of plant development and considers effects of climatic factors (e.g., temperature, light, and water) on physiological processes in plants. The text also presents an overview of the physical and chemical characteristics of tropical soils. The ecophysiology of the major crop plants, particularly those suitable for the wet tropics, including rice, sugarcane, pineapple, grasslands, root crops, sweet potato, coffee, cacao, rubber, banana, tea, oil palm, coconut palm, citrus, cashew, and mango, is also considered. Plant ecologists, plant physiologists, biochemists, horticulturists, agronomists, meteorologists, soil scientists, food technologists, plant breeders, and people interested in the production of tropical crops will find the book invaluable.
The Role Of Centrosema, Desmodium, And Stylosanthes In Improving Tropical Pastures by Robert L Burt,Peter P Rotar,J. L. Walker,M. W. Silvey Pdf
This integrated collection describes the importance of forage legumes for pasture development and improvement in the tropics and subtropics. Leading agronomists review the magnitude of the need for pasture improvement; tropical and subtropical soil and climate environments; reports of the successful use of legumes in pasture development in a wet and a dry tropical environment; and the scope of the problem in terms of area to be developed and development logistics required. Three legume genera, Centrosema, Desmodium, and Stylosanthes, are discussed in detail--information is presented on taxonomy, adaptation, distribution, productivity, and usefulness--and considerable emphasis is placed on Rhizobium germplasm resources for these genera. A concluding section of technical essays addresses special considerations in using tropical legumes in pasture development and presents a coordinated multidisciplinary approach to legume exploration and evaluation.
Properties and Management of Soils in the Tropics by Pedro A. Sanchez Pdf
Long-awaited second edition of classic textbook, brought completely up to date, for courses on tropical soils, and reference for scientists and professionals.
