61. IALC: Soils Of Arid Regions Of The U.S. And Israel: Databases Of Soil Publicatio This database covers soils, agriculture, mycology, entomology, veterinary science,developing countries, public health, and related topics. http://cals.arizona.edu/OALS/soils/databases.html

Soils Home Other Resources Databases of Soil Publications CAB ABSTRACTS is the most comprehensive database for publications about soils in arid regions. This database covers soils, agriculture, mycology, entomology, veterinary science, developing countries, public health, and related topics. CAB ABSTACTS is produced by CAB INTERNATIONAL. CAB INTERNATIONAL Database Marketing Executive Wallingford Oxon, OX10 8DE United Kingdom Telephone: +44 1491 832111 Fax: +44 1491 826090 E-Mail: online@cabi.org PASCAL is produced by the Institut de l'Information Scientifique et Technique (INIST) of the French National Research Council (CNRS). This database is multidisciplinary; its principal subject areas are: physics and chemistry; life sciences (including biology, medicine, and psychology); applied sciences and technology; earth sciences; and information sciences. CNRS/ INIST 2, allee du Parc de Brabois

62. Sustainable Agriculture-Key Text Around the world the concept of sustainable agriculture has been Australia hasmore than 7 million hectares of acid soils, which cost the nation around http://www.science.org.au/nova/071/071key.htm

Key text Published by Australian Academy of Science Sponsored by With the population exceeding 6 billion and growing by about 6 million a month, the need to protect agricultural land and to increase food production has become critical. Does sustainable agriculture have the answers? Printer-friendly version of complete topic About 5000 years ago, large cities were flourishing in the flat plains of what is now southern Iraq. The cities were surrounded by thousands of hectares of crop land irrigated from the rivers. Farmers grew barley, wheat, flax, dates, apples, plums and grapes, and herded sheep and goats for meat and milk. This early example of intensive agriculture proved unsustainable. By around 4000 years ago, desert had replace the fields and the cities had been abandoned. History records many such examples of agricultural communities flourishing and then failing, often because farming eroded the soil, exhausted the soil’s nutrients or caused a build-up of salt. There were many fewer mouths to feed in those days; the global population was probably no more than a couple of hundred million. So if agriculture failed in one area, plenty of arable land remained available for development. The world no longer has that luxury. The need to protect agricultural land and to increase food production has become critical. Around the world the concept of sustainable agriculture has been embraced to try to ensure that food supplies will continue to match demand.

63. Department Of Crop And Soil Sciences In response to these problems, crop and soil scientists are turning their attentionto pesticide accumulation in soils, agriculture waste disposal, http://www.css.msu.edu/AboutCSS.cfm

About CSS Department of Crop and Soil Sciences Academic Programs Courses Facilities Contacts ... Tour our Department Crop and Soil Sciences is a diverse profession that encompasses all aspects of crop production and soil management. The goal of the crop scientist is to increase plant production, quality and profit by utilizing genetics, breeding and physiology. The goal of the soil scientist is to improve the soil fertility and the chemical, physical, and microbial characteristics of the soil. These two subjects are combined in Crop and Soil Sciences to develop an integrated approach to the management of crops and soils. Another aspect to Crop and Soil Sciences is turfgrass management. While not directly involved with the production of food or fiber, turfgrass science encompasses many of the same agronomic principles and applies them to the management of grasses for use on golf courses, athletic fields, home lawns, and recreational areas. Turfgrass adds beauty to the landscape, minimizes sound and air pollution, stabilizes the soil, and reduces the heat load on homes through transpirational cooling. Many of the past crop production practices have resulted in environmental problems. The general decline in environmental quality has affected crops as well as the soil. In response to these problems, crop and soil scientists are turning their attention to water pollution, pesticide accumulation in soils, agriculture waste disposal, wind and water erosion and a myriad of other management concerns.

64. EPA - Savannah River Basin The suite of indicators included landcover types, uindex, agriculture on agriculture on highly erodible soils, agriculture on moderately erodible http://www.epa.gov/nerlesd1/land-sci/area.htm

Landscape Ecology Recent Additions Contact Us Print Version Search: EPA Home Exposure Research Environmental Sciences Landscape Ecology ... EPIC Quantification of Landscape Indicators/Aquatic Resource Associations in the Savannah River Basin AREA DESCRIPTION The Savannah River Basin is arrowhead-shaped, trending generally northwest to southeast. The basin spans three ecoregions: Blue Ridge, Piedmont and Coastal Plain. Landcover types are derived from MRLC data, nominal base year 1992. Differences among the three ecoregions are evident in the forest landcover ( Figure 1 ). Deciduous and evergreen forests predominant in the Blue Ridge and Piedmont ecoregions; all forest types account for 64.7 to 83.49% of the total land cover. Forest landcover accounts for 37.20 to 53.35% of the landcover in the Coastal Plain, with evergreen forests the predominant forest type. Wetland landcover types are found primarily in the Coastal Plain, accounting for 11.10 to 35.93% of the total landcover, most of it in woody wetlands. Wetlands comprise less than one percent of the landcover outside the Coastal Plain. Scientists from the U.S. Environmental Protection Agency (EPA), Region 4, Science and Ecosystem Support Division, enlisted the assistance of the landscape ecology group of U.S. EPA, Office of Research and Development (ORD), National Exposure Research Laboratory, Environmental Sciences Division (ESD), in conducting a landscape assessment of the Savannah River Basin as part of their ongoing Regional Environmental Monitoring and Assessment Program (REMAP) demonstration project. In the Scope of Work provided by Region 4, the goal was stated as "provide technical/scientific assistance ... to EPA Region 4 in assessing current wadeable stream conditions in the Savannah River Basin with landscape factors that may be contributing to these conditions or gradients." Three specific

65. Soils And Agriculture Resources To permanet@sunsite.unc.edu; Subject soils and agriculture Resources;From Lawrence F. London, soils 5104. Sites Relating to soils and agriculture http://www.ibiblio.org/ecolandtech/permaculture/mailarchives/permaculture-links/

[Prev] [Next] [Index] [Thread] Soils and Agriculture Resources To permanet@sunsite.unc.edu Subject : Soils and Agriculture Resources From london@nuteknet.com Date : Fri, 18 Apr 1997 22:08:11 -0400 Organization : Venaura Farm - Producer Of Naturally Grown Vegetables Reply-To london@nuteknet.com http://www.soils.umn.edu/academics/classes/soil5104/sept30/soils.html Lawrence F. London, Jr. mailto:london@sunSITE.unc.edu http://sunSITE.unc.edu/InterGarden Title: Soils and Agriculture Resources Soils 5104 Sites Relating to Soils and Agriculture Soil Science Society of America Farm Journal Today Soilmoisture Equipment Corp. The USDA Home Page ... Natural Resources Conservation Service The US Agricultural Research Service The US Geological Survey Minnesota River Agricultural Basin Web's Home Page World Soil UMN Soil Science Web Server ... The Minnesota Climatology Working Group Home Page Fisher Scientific's online catalog The National Society of Consulting Soil Scientists The WWW Virtual Library listing for Forestry; Soils and Substrates This is a Finnish site with many soils related links and a number of on-line information resources Home Period 1 Prev: Building Your Soil Next: McKenzie Rock Flour Index(es): Main Thread

66. Soils And Agriculture Resources To sustaglinks@sunsite.unc.edu; Subject soils and agriculture Resources;From Lawrence F. soils 5104. Sites Relating to soils and agriculture http://www.ibiblio.org/ecolandtech/agriculture/feedback/new-links/msg00336.html

[Prev] [Next] [Index] [Thread] Soils and Agriculture Resources To sustag-links@sunsite.unc.edu Subject : Soils and Agriculture Resources From london@nuteknet.com Date : Fri, 18 Apr 1997 22:08:28 -0400 Organization : Venaura Farm - Producer Of Naturally Grown Vegetables Reply-To london@nuteknet.com http://www.soils.umn.edu/academics/classes/soil5104/sept30/soils.html Lawrence F. London, Jr. mailto:london@sunSITE.unc.edu http://sunSITE.unc.edu/InterGarden Title: Soils and Agriculture Resources Soils 5104 Sites Relating to Soils and Agriculture Soil Science Society of America Farm Journal Today Soilmoisture Equipment Corp. The USDA Home Page ... Natural Resources Conservation Service The US Agricultural Research Service The US Geological Survey Minnesota River Agricultural Basin Web's Home Page World Soil UMN Soil Science Web Server ... The Minnesota Climatology Working Group Home Page Fisher Scientific's online catalog The National Society of Consulting Soil Scientists The WWW Virtual Library listing for Forestry; Soils and Substrates This is a Finnish site with many soils related links and a number of on-line information resources Home Period 1 Prev: home page Next: McKenzie Rock Flour Index(es): Main Thread

67. AllSearchEngines.co.uk !! Web Directories Categories related to Science agriculture soils Research on physicochemistryand biology of agricultural soils, metabolism and nutrition of crops, http://www.allsearchengines.co.uk/cgi-bin/mozzy/dir.cgi?/Science/Agriculture/Soi

68. Organic Soils And Peat Materials For Sustainable Agriculture Organic soils and Peat Materials for Sustainable agriculture provides detailedinformation from a worldwide perspective on the degradation process of http://www.chipsbooks.com/orgsoils.htm

C.H.I.P.S. HOME PAGE AGRICULTURE CATALOG TITLE LIST MANUAL ORDER FORM ... QUESTIONS COMMENTS Soil Science Reference Book from C.H.I.P.S. Organic Soils and Peat Materials for Sustainable Agriculture edited by Leon E. Parent and Piotr Ilnicki Illustrates the moorsh-forming process as a global index of soil degradation and climatic change in drained organic soils Provides ideal management practices for long-term agricultural use of organic soil and cutover peatlands Displays field-recognizable pedological features associated with reduced soil quality or climatic change Presents physical attributes for quantifying hydrophobicity, hydraulicity, and the pore space complex influencing plant productivity in organic soils and peat substrates Reviews pesticide and Cu reactions in organic soils Organic Soils and Peat Materials for Sustainable Agriculture provides detailed information from a worldwide perspective on the degradation process of fragile peat resources used for agriculture. It documents the best management practices and defines and quantifies soil quality indicators and pedo-transfer functions for organic soils and peat materials. Co-published with the International Peat Society, this reference is the first to integrate the physical, chemical, and biological aspects of organic soils and peat materials for sustainable agriculture and horticulture. It details the principles and indicators behind positive action in sustainable management. The book presents a complete analysis of how peat works chemically, physically, and ecologically. It quantifies the moorsh-forming, or peat degradation, process in tables and figures, provides conversion equations among pH determination methods, and supplies a novel diagnosis of N and P release. In addition, the book revisits water, pesticides, phosphorus, and copper sorption characteristics of organic soils.

69. Science: Agriculture And Soils The CHRIS imaging spectrometer is the principal payload of ESA s PROBA platform. http://www.rsacl.co.uk/chris/science/agric.htm

AGRICULTURE AND SOILS Objectives The main objective of the land studies is to derive estimates of land surface biochemical (chlorophyll content) and biophysical (LAI/biomass, albedo, fAPAR) properties by inverting semi-empirical and physically based BRDF models against sample sets of hyperspectral directional reflectance measurements acquired by CHRIS. In addition to specific BRDF studies, the hyperspectral data will also be used to investigate 'red edge' shifts in wavelength as a function of canopy biochemistry (chlorophyll content/concentration). One can consider some advantages and disadvantages of three different types of BRDF model: Physically based based on approximations to radiative-transfer equations computationally intensive numerical inversion techniques sensitive to initial estimates of model parameters Empirical computationally simple poor extrapolation beyond solar and sensor angles for which reflectance data are available Semi-Empirical computationally efficient analytical solutions to model inversion using matrix-based techniques scale linearly The overall aim is to assess the ability of multi-angle reflectance data sampled using the CHRIS sensor to retrieve/estimate land surface biophysical properties (LAI, albedo etc). An element of this will include direct comparison of the retrieved parameter values against ground-based measurements of the same parameters. The surface biophysical parameters will be estimated from the CHRIS data using a number of different techniques, ranging from traditional (the so-called vegetation indices), through more recent developments (such as red-edge position (REP), to more advanced techniques (notably BRDF model inversion). The validation exercise will look at the accuracy/precision with which atmospherically-corrected CHRIS data can be used to determine the basic surface radiation fields, as well as at the ability to retrieve properties such as LAI, albedo, etc. through the application of vegetation indices, REP techniques and BRDF model inversion.

70. Manitoba Soil Science Society - Soils Agronomy Database -- 1957 To 2003 - Manito Manitoba agriculture and Food. soils hdr. June 2005. Manitoba Soil ScienceSociety soils Agronomy Database 1957 to 2005 http://www.gov.mb.ca/agriculture/news/msss/

June 2005 Manitoba Soil Science Society - Soils Agronomy Database 1957 to 2005 The Manitoba Soil Science Society (MSSS) was organized in 1957 as a network to bring together Pedologist and other soils researchers in related fields. Soils related research is presented and discussed annually at the MSSS Annual General Meeting and published in a proceedings. The following is a searchable index for proceedings printed between 1957-2005. Actual versions of papers can be retrieved for the 1990 -2005 versions. Reports can be searched by key word in the title and/or by author. Search the database by: Title Author From: To: Government Links: home welcome on-line services news ... privacy

71. Vegetative Filter Strips For Agriculture, NF97-352 Therefore, a larger strip width is needed for removing finer soils. runoff ofsome agricultural nonpoint source contaminants, such as soil nutrients, http://ianrpubs.unl.edu/water/nf352.htm

Nebraska Cooperative Extension NF 97-352 (Revised May 1997) Vegetative Filter Strips for Agriculture By Thomas G. Franti, Surface Water Management Specialist Previous Category Catalog Order Info Vegetative Filter Strips ... Summary Table I. Practices and contract life for filter strip and buffer practices eligible for use under the continuous CRP sign up. Eligible Practice Contract Life Grassed waterways 10 years Grass filter strips 10-15 years Contour buffer strips 10 years Riparian forest buffers 10-15 years Field wind breaks 10-15 years Farmstead wind breaks 10-15 years Reference: NRCS list of practices eligible for continuous CRP signup, 2-28-97. Table II. Minimum filter strip width recommended by NRCS for maximum field to filter area ratio of 30:1 (30 acres of cropland draining to 1 acre of grass filter). Field slope, % Minimum width, ft Reference: Standards and Specifications No. 393, USDA-NRCS Field Office Technical Guide, 1988. Vegetative filter strips, sometimes referred to as grass filter strips or grass buffer strips, are areas that are seeded to close growing or sod forming grasses at locations where runoff water leaves a field within and next to cropland. They are designed to filter out the sediment, organic material, nutrients, and chemicals carried in runoff water. Vegetative filter strips also are placed along water courses, streams, ponds and lakes to protect surface water. Grass filters also can be used to filter wastewater from agricultural processing facilities. Currently, in Nebraska, there is great interest in using vegetative filter strips to improve surface water quality. The Nebraska Corn Growers Association and Natural Resources Conservation Service (NRCS) are two examples of groups with recently announced vegetative filter strips programs.

72. PSB - Plants, Soils Biometeorology Dept, College Of Agriculture Utah State University Plants, soils Biometeorology, College of agriculture. http://www.psb.usu.edu/

73. PSB - Plants, Soils Biometeorology Dept, College Of Agriculture Utah State University Plants, soils Biometeorology, College of agriculture. http://www.psb.usu.edu/people/faculty/?iddg=40

74. UACES: AR Agriculture: Crops, Soils, And Water Management University of Arkansas Cooperative Extension Service AR agriculture Crops,soils and Water Management. http://www.aragriculture.org/cropsoilwtr/default.asp

Agriculture and Weather Links Arkansas Weekly Crop Report Corn Cotton ... AR Agriculture Home Crops, Soils, and Water Management This page is dedicated to provide educational training and support to County Extension Agents and producers that enhances sustainable crop production, improves profitability and competitiveness of producers, and improves the water, air, and soil environmental quality, for the purpose of allowing Arkansas producers to continue serving as a national leader in the production of food and fiber. This is to be accomplished through delivery of production updates, fact sheets, information sheets, and computer-assisted management programs that allow producers to make informed decisions in the production of row crops in Arkansas. Asian soybean rust, a potentially devastating disease, was confirmed in Arkansas and nine other southern states in late November, 2004. For additional information on this topic please visit Soybean Rust located on this site. Public Issues Hot Topics News Publications ... U A E X Home UA Cooperative Extension Service University of Arkansas · Division of Agriculture · Cooperative Extension Service 2301 South University Avenue · Little Rock, Arkansas 72204 · USA

75. Food, Agriculture, Gardening & Soils Supply Natural Waters Energy Transportation Recycling ToxicsP2 GreenBuilding agriculture soils Forestry Trees Landscaping Parks http://www.ecoiq.com/onlineresources/calendar/agriculture.html

Home Stewardship Sustainability Business ... EcoSpeakers.com - a speakers bureau offering a wide range of speakers for conferences, meetings, and other programs - is underwriting the creation and maintenance of this page of The EcoGateway Calendar. January 2005 January 4-8, 2005 http://www.sicb.org/meetings/2005/index.php3 January 28-30, 2005 http://nofany.org/index.html February 2005 February 5-11, 2005 http://www.rangelands.org/texas2005 February 25, 2005 http://www.mc-mncppc.org/parks/brookside/calendar.shtm March 2005 March 7-11, 2005 http://www.asprs.org/baltimore2005/index.html April 2005 April 2-5, 2005 http://www.asns.org/annual.html May 2005 May 17-21, 2005 http://www.nrharural.org/pagefile/NRHAconf.htm June 2005 June 18-22, 2005 http://www.amseed.com/mtg_2005ac_index.asp July 2005 July 9-12, 2005 http://www.ofa.org August 2005 No Events Listed September 2005 September 11-14, 2005 http://www.aaccnet.org/meetings/2005/default.asp October 2005 October 30-November 2, 2005 http://www.farmequip.org November 2005 November 30-December 1, 2005 http://www.aep.iastate.edu/calendar/homepage.html

76. Agricultural And Resource Economics Review: Some Hard Truths About Agriculture A Full text of the article, Some Hard Truths About agriculture and the and aslong as crops are planted in natural soils, agriculture will be subject to http://www.findarticles.com/p/articles/mi_qa4046/is_200404/ai_n9396968

@import url(/css/us/style1.css); @import url(/css/us/searchResult1.css); @import url(/css/us/articles.css); @import url(/css/us/artHome1.css); Home Advanced Search IN free articles only all articles this publication Automotive Sports FindArticles Agricultural and Resource Economics Review Apr 2004 Content provided in partnership with 10,000,000 articles Not found on any other search engine. Featured Titles for Academy of Marketing Science Review Accounting Historians Journal, The Accounting History AgExporter ... View all titles in this topic Hot New Articles by Topic Automotive Sports Top Articles Ever by Topic Automotive Sports Some Hard Truths About Agriculture and the Environment Agricultural and Resource Economics Review Apr 2004 by Lichtenberg, Erik Save a personal copy of this article and quickly find it again with Furl.net. It's free! Save it. Environmental problems in agriculture have proven difficult to address due to the spatial heterogeneity and temporal variability intrinsic to agriculture. Agriculture is largely a struggle against nature; both its sustainability and the prospects for improving environmental performance and farm income simultaneously are thus inherently limited. Agriculture's high degree of variability makes direct regulation inefficient. Subsidies for improving environmental performance can have negative consequences and have proven ineffective in practice, due largely to bureaucratic culture. Pollution taxes should be the most effective and efficient form of policy. Interdisciplinary research is needed to provide models for performance evaluation.

77. Homepage - Sustainable Agriculture (Soils 345), Washington State University Sustainable agriculture (soils 345) Gain a holistic perspective of agricultureand food while exploring your own values with respect to sustainability. http://classes.css.wsu.edu/soils345/

Home Course syllabus Reading Resources Sustainable Agriculture (SOILS 345) Spring 2002 Washington State University - Pullman Johnson Hall, Room 116 Instructors: Dave Bezdicek and Cathy Perillo Develop a basic understanding of food and farming systems, their components, and the role of sustainability in those sectors. Explore how biotic and abiotic factors affect food production and consumption. Develop critical thinking and problem-solving skills necessary for evaluating complex systems (and for using in the ‘real world’!). Course will incorporate classroom discussions and presentations, guest experts, case studies, field trips,and independent projects. Gain a holistic perspective of agriculture and food while exploring your own values with respect to sustainability. Prerequisites: 1 semester each college-level physical and biological science. Otherwise open to ALL folks, with and without agricultural backgrounds. Cooperative course taught jointly by WSU and UI. 1 semester, 3 credit hours For more information, contact Dave Bezdicek (

78. Soils soils, agriculture and Landuse Canada Soil capability for agriculture,Maps National Atlas of Canada, G1115 C3 1985 (shelved with G3401) http://www.geog.mcgill.ca/heeslib/Soils.html

Walter Hitschfeld Geographic Information Centre Environmental Maps and Virtual Resources Introduction Biogeography Climate Energy ... Pollution [ Soils ] [ Water Soils, Agriculture and Landuse Maps Title Location Call Number Affectation du sol Maps: Montreal Occupation du Sol Maps: Montreal Maps: Quebec Landuse information series [various regions] Maps: Northern Canada Canada: Agricultural lands Maps: National Atlas of Canada (shelved with G3401) Canada: Soil capability for agriculture Maps: National Atlas of Canada (shelved with G3401) Canada - Farm operators Maps: National Atlas of Canada (shelved with G3401) Canada - Farm types Maps: National Atlas of Canada (shelved with G3401) The Saint-Lawrence - at the heart of an inhabited area: Population and landuse along banks (in Environmental Atlas of the Saint-Lawrence) Maps: Canada (shelved at G3402 S2) Generalized land use [various regions] Maps: Canada Land Capability analysis [various regions] Maps: Canada Soil capability for agriculture [by province] Maps: Canada Critical capability areas [by province] Maps: Canada Soils of Canada Maps: Canada Soil climates of Canada Maps: Canada Soil organic carbon Maps: Canada Soil Capability for Agriculture [various regions] Maps: Canada Land use and land cover [various regions] Maps: US European Community: farming Maps: Europe Ecology of Landuse in Central Europe (in Atlas of Eastern and Southern Europe) Maps: Europe Soil Map of Europe Maps: Europe Desertification Map of the Africa Maps: Africa Soil Map of Africa Maps: Africa Cashcrops: Coffee and cocoa

79. Journey To Planet Earth . Educational Resources | PBS The idea for Sustainable agriculture — It All Starts with the Soil grew out What similarities/differences are there in the soils where agriculture is http://www.pbs.org/journeytoplanetearth/education/agriculture.html

EDUCATIONAL RESOURCES: Education Home Episode Guide Photo Gallery The Journey to Planet Earth Action Kit ... Teachers Guides Sustainable Agriculture Internet Resources The State of the Planet Citizens for Planet Earth Sustainable Agriculture — It All Starts with the Soil The idea for "Sustainable Agriculture — It All Starts with the Soil" grew out of a desire by Screenscope, Inc. , the producer of the PBS television series Journey to Planet Earth, and South Carolina ETV to expand on the idea of sustainable agriculture and to teach youngsters about its importance in their lives. This educational package combines video excerpts from the third program in the Journey to Planet Earth series, Land of Plenty, Land of Want , with solid background information on soil and two fun hands-on activities. Soil was selected as the focus because, as Pennsylvania farmer Steve Groff says in Land of Plenty, Land of Want , "Soil is my number one asset." "Sustainable Agriculture — It All Starts with the Soil" is available in PDF (This file is 104K) Along with teaching kids about soil, "Sustainable Agriculture — It All Starts with the Soil" also demonstrates to youngsters how agriculture is real science, just like chemistry or biology (See "

80. Soils And Environment: Index 93106 Hawaii History Spelled Out in Islands’ soilsAnother article, “soils, agriculture, and Society in Precontact Hawaii,” publishedin Science, analyzes the dryland field system of Kohala, located on the http://interactive.usask.ca/ski/agriculture/soils/soilform/

What is Soil? Soil Formation Soil Classification Soil Physics Soil Chemistry Living Soil ... Soil Zones Soils were considered as a natural body by Russian and US scientists in the late 1800s. This allowed scientists to study and classify soils with the objective of trying to understand soil formation from an environmental perspective. They recognized that soils were formed by weathering of surface deposits or "parent materials" by processes that were physical; chemical; and biological. The concept of soil forming factors allows scientists to understand and classify soils more clearly. Parent Materials Soils are formed by weathering of "parent materials". These materials have many origins such as bedrock surfaces, aolian (wind blown), lacustrine (from glacial lake beds), alluvium (river) and organic (peat) deposits. Many of our soils have been developing since the last ice age - some 10 thousand years ago. The advance and retreat of glaciers ivolved most of the province except for the highlands associated with Cypress Hills region. Soil is in a dynamic equilibrium. It is always changing as a result of its interaction with the environment. As wind and water erode particles from the surface of the profile, weathering produces more soil from the parent material. If loss of soil by erosion exceeds the production of new soil by weathering then catastophic consequences can occur as seen in the "dirty thirties".

Page 4     61-80 of 121    Back | 1  | 2  | 3  | 4  | 5  | 6  | 7  | Next 20