AGROFORESTRY IN NORTH AMERICA
Proceedings of the First Conference o­n Agroforestry in North America
13-16 August 1989

Department of Environmental Biology, o­ntario Agricultural College, University of Guelph
Guelph, o­ntario, Canada

Peter Williams, Editor

Keynote Address: Agroforestry in North America: the Next Generation
John B. Raintree, International Centre for Research in Agroforestry.

Black Walnut Integrated Forestry-Farming - a Case History
H.E. Garrett, J. Jones, W.B. Kurtz & J.P. Slusher, University of Missouri.

Intercropping Valuable Hardwood Tree Species and Agricultural Crops in Southern o­ntario: A Research Perspective
A.M. Gordon & P.A. Williams, University of Guelph

Some Aspects of Competition for Environmental Resources in Alley Cropping
C. Ssekabembe & P.R. Henderlong, Ohio State University

Agroforestry: The Southern Indiana Experience of Growing Oak, Walnut, Corn and Soybeans
J.R. Seifert, Southeast Purdue Agricultural Center. (Abstract o­nly)

Short Rotation Hybrid Poplar Woody Crops in Eastern o­ntario: Forestry in an Agricultural Setting
B. Hollingsworth, o­ntario Ministry of Natural Resources. (Abstract o­nly)

Potassium Uptake from Subsoil by Mature Erythrina poeppigiana
J.C. Mayne, University of Florida

Afforestation of Former Farmland with High-Value Hardwoods
F.W. von Althen, Forestry Canada

Uses of Short-Rotation Woody Crops in Agroforestry: An Iowa Perspective
R.C. Schultz, J.P. Colletti & R.B. Hall, Iowa State University

An Iowa Demonstration of Agroforestry: Short-Rotation Woody Crops
J.P. Colletti, R.C. Schultz, R.B. Hall, C.W. Mize, & C.J. Twarok, Iowa State University

Highspeed Forestry as an Agroforestry Option
H.W. Anderson, J.A. Rice, C.P. Chen & J.A. Winters, o­ntario Forest Research Institute

Pre-emergent Herbicides for Site Preparation in Ultrashort-Rotation Willow Plantings: Early First-Year Results
R.F. Kopp, L.P. Abrahamson, C.A. Nowak, & E.H. White, State University of New York

De-awning of Agropyron spicatum Cultivar for use as an Understory Grass upon Erosive Sites
C.J. Goebel and M. Tazi, Washington State University.

Conversion of a Second-growth Hardwood Stand to Black Walnut
G.R. Goff & J.P. Lassoie, Cornell University

Recent Agroforestry Developments in Central Saskatchewan and Potential for Growth
J. Johnston, Forestry Canada

Woodland Management and Agroforestry Potential Among Dairy Farmers in Lewis County, New York
W.S. Teel & J.P. Lassoie, Cornell University

Directions for Agroforestry Research and Extension in Northeastern North America
J.P. Lassoie, W.S. Teel & K.M. Davies, Jr., Cornell University

Private Woodlands as Cash Reserves
L. Nelson, Winrock International. (Abstract o­nly)

The Geographical Distribution of Freeze-Thaw Conditions as an Indicator of the Relative Potential for Maple Sugar Harvesting
G.F. Tucker, K.L. Eggleston & J.P. Lassoie, Cornell University. (Abstract o­nly)

Canopy Structure, Light Penetration and Tree Growth in a Slash Pine (Pinus elliottii) Silvo-Pastoral System at Different Stand Configuration in Florida
W. Sequeira & H.L. Gholz, University of Florida

The Effect of Cattle Grazing o­n Ponderosa Pine Regeneration
J.L. Kingery & R.T. Graham, University of Idaho

Browse Agroforestry using Honey Locust
A. Wilson, Springtree Tree Crops Project

Economic Benefits of Field Shelterbelts o­n the Prairies
T. Loeppky & J., Kort, Prairie Farm Rehabilitation Administration Shelterbelt Centre

Nut Trees as Intercrops, Windbreaks and Orchards
R.D. Campbell, Campberry Farms

Sustaining Multiple Use o­n Marginal Land: Agroforestry in the Southeast
R.L. Harwell & C.W. Dangerfield, Jr., Clemson University & University of Georgia

Financial Aspects of Using Agroforestry to Control Erosion o­n Northwest Missouri Farms
S.L. Thurman, W.B. Kurtz & M.J. Monson, University of Missouri.

Genetic Improvement of Black Locust, a Prime Agroforestry Species
J.W. Hanover, T. Mebrahtu & P. Bloese, Michigan State University

Pollination: A Crucial Link in Agroforestry and Sustainable Agriculture
P.G. Kevan, E.A. Clarke & V.G. Thomas, University of Guelph

Assessing Contributions of Environment to Agriculture
V.G. Thomas, P.G. Kevan & E.A. Clarke, University of Guelph (Abstract o­nly)

Closing Remarks/Synthesis
H.E. Garrett, University of Missouri

POSTER ABSTRACTS

Alley Cropping with Nitrogen-Fixing Trees and Vegetables in Northeast U.S.A.
R.R. Janke, Rodale Research Center

Nitrogen Cycling in Intercropped Black Locust and Barley
P. Ntayombya and A.M. Gordon, University of Guelph

Width and Orientation of Corn Rows Affect Growth of Interplanted Hardwood Seedlings
H.D.J. McLean, K.M. King, A.M. Gordon and T.J. Gillespie, University of Guelph

The use of Ramial Chipped Wood for both Agricultural and Forestry Purposes: the Importance of the Humification Process
G. Lemieux, University of Laval.

Utilizing Riparian Trees to Absorb Nitrate Leaching from Agricultural Fields
G.J. O'Neill and A.M. Gordon, University of Guelph

Sugar Bush Management Realistic Expectations
C. Coons, o­ntario Ministry of Agriculture and Food

Testing Manure Slurry as a Cattle Repellent in an Agro-silvo-pastorial System
P.G. Bezkorowajnyj and A.M. Gordon, University of Guelph.

Tubex Tree Shelters
P. Quail, The St. George Company Ltd.

Agroforestry in the Southern U.S.

C.E. Lewis, G.W. Tanner & H.A. Pearson. Southeastern Forest Experiment Station & Dept. Wildlife and Range Sci. University of Florida.

Living windbreaks the Basis of Future Crop Production
C.S. Baldwin & C. Nanni, Ridgetown College of Agricultural Technology.

Windbreaks in Eastern o­ntario
E. Boysen, o­ntario Ministry of Natural Resources

The Use of Optical Porosity in Evaluating Windbreak Shelter Characteristics
A.E. Loeffler and A.M. Gordon, University of Guelph

Effects of Tree Planting Pattern o­n Conifer/Pasture Competition in a Western Oregon Agroforest U.S.A.
S.H. Sharrow & W.H. Emmingham, Oregon State University

Shelter Effects in Agroforestry
S. Green and N. Hutchings, Macaulay Land Use Research Inst.

Herbage Production under Conifer Agroforestry in the UK
A.R. Sibbald, J.H. Griffiths and D.A. Elston, Macaulay Land Use Research Institute and Scottish Agricultural Statistics Service

The Economics of Nut cropping in Southern o­ntario
D. Ball, D.P. Stonehouse and A.M. Gordon, University of Guelph

Agroforestry Research in Southern o­ntario
A.M. Gordon and P.A. Williams, University of Guelph

A Pilot Study of Leucaena leucocephala (Lam) de Wit and Maize in an Alley Cropping System o­n Calcareous Soils of Zanzibar Island, Tanzania
F. Borsa and V. Souza-Machado, University of Guelph.