Books written by Bobby A. Stewart

  • Soils and Global Change
    Soils and Global Change

    The LEACHM model ( Wagenet and Hutson , 1987 ) uses a numerical solution to the Richard's equation and was selected ... data and to calculate the " a " and " b " parameters of Campbell's equation ( Campbell , 1985 ) for use in LEACHM .

  • Global Climate Change and Tropical Ecosystems
    Global Climate Change and Tropical Ecosystems

    The chapters cover: Characteristics of tropical ecosystems Soil and biotic carbon pools Impacts of land use and soil management Slash-and-burn practices Crop residue and fertility management This volume adds to the understanding of ...

  • Soil Management and Greenhouse Effect
    Soil Management and Greenhouse Effect

    John M. Kimble, Elissa R. Levine, Bobby A. Stewart. CHAPTER 5 Carbon Sequestration in Corn - Soybean Agroecosystems D.R. Huggins , C.E. Clapp , R.R. Allmaras , and J.A. Lamb , I. Introduction Soil organic matter ( SOM ) has been reduced ...

  • Soil Management: Experimental Basis for Sustainability and Environmental Quality
    Soil Management: Experimental Basis for Sustainability and Environmental Quality

    Experimental Basis for Sustainability and Environmental Quality Bobby A. Stewart. enhancing per capita food production from existing arable land without jeopardizing its productivity potential and damaging the environment .

  • Soil Classification: A Global Desk Reference
    Soil Classification: A Global Desk Reference

    The documentation in this book serves as a foundation for the revision of existing soil taxonomies and the creation of new ones.

  • Integrated Weed and Soil Management
    Integrated Weed and Soil Management

    J. L. Hatfield, Bobby A. Stewart. This shift to reliance on herbicides has led to unanticipated yet fundamental problems . One problem is that some plant species have developed resistance to widely used herbicides .

  • Interacting Processes in Soil Science
    Interacting Processes in Soil Science

    R.J. Wagenet, Philippe Baveye, Bobby A. Stewart. 2. Effect of Exchangeable Magnesium Exchangeable Mg can cause a deterioration in soil structure and develop a " magnesium solonetz " ( Ellis and Caldwell , 1935 ) .

  • Structure and Organic Matter Storage in Agricultural Soils
    Structure and Organic Matter Storage in Agricultural Soils

    M.R. Carter, Bobby A. Stewart. surfaces which are less capable of binding new SOM strongly enough for it to resist further biological attack . Indeed , adsorption and other reversible binding mechanisms may increase the decomposability ...

  • Soil Processes and Water Quality
    Soil Processes and Water Quality

    Bobby A. Stewart. Table 3. Percentage of water collected as leachate from lysimeters as affected by tillage Annual mean % of water collected Year Crop Conventional tillage No - tillage 1975-76 Corn 49 88 1976-77 Corn 52 83 1977-78 Corn ...

  • Soil Structure: Its Development and Function
    Soil Structure: Its Development and Function

    Its Development and Function Bobby A. Stewart, K.H. Hartge. 150 end of shearing ( normal and shear strength , removed ) 10 0 normal stress applied - + 5 shearing starts 100shear strength ( kPa ) pore water pressure ( kPa ) 5 height ...

  • Subsoil Management Techniques
    Subsoil Management Techniques

    Bobby A. Stewart, N.S. Jayawardane. Table 2. Penetration of unconfined fragments of sodic and calcic clay by ryegrass roots Ryegrass roots Mass ( mg ) Ryegrass - gypsum 8.9 Ryegrass + gypsum 18.5 LSD ( P = 0.05 ) 5.9 * In 5 g air - dry ...

  • Methods for Assessment of Soil Degradation
    Methods for Assessment of Soil Degradation

    Rattan Lal, Winfried E. H. Blum, C. Valentin, Bobby A. Stewart. 1. Dregne and Chou Study Dregne and Chou ( 1992 ) estimated the spatial extent and productivity effects of land degradation in dry areas in most countries of the world ...

  • Animal Waste Utilization: Effective Use of Manure as a Soil Resource
    Animal Waste Utilization: Effective Use of Manure as a Soil Resource

    This book examines the beneficial aspects of animal waste as a soil resource. Topics include: types of livestock waste, methods of waste utilization, storage, application of animal waste, and new management techniques.

  • Assessment Methods for Soil Carbon
    Assessment Methods for Soil Carbon

    The book establishes the need for standardized methods that can be used by anyone, and helps us better understand the link between the pedosphere (soils) and the atmosphere.

  • Climate Change and Global Food Security
    Climate Change and Global Food Security

    In order to feed their burgeoning populations, developing nations will need to double cereal production by the year 2050.

  • Encyclopedia of Water Science (Print)
    Encyclopedia of Water Science (Print)

    Four basic methods of achieving this are the use of appropriate crops and crop sequence , soil surface management ... D.W .; Dixon , J. , ( Eds . ) Sustainable Dryland Cropping in Relation to Soil Productivity — FAO Soils Bulletin 72 ...

  • Fractals in Soil Science
    Fractals in Soil Science

    The application of fractals and fractal geometry in soil science has become increasingly important over the last few years. This self-contained and timely book was designed to provide detailed and...