Alberta Agriculture (1989). 1989 Agricultural Statistics Yearbook. Publication no. Agdex 853–10. Edmonton, AB.
Atmospheric Environmental Service (1982 a). Canadian Climate Normals. 1951–1980. Volume 2 – Temperature. Downsview: Atmospheric Environment Service.
Atmospheric Environmental Service (1982 b). Canadian Climate Normals. 1951–1980. Volume 3 – Precipitation. Downsview: Atmospheric Environment Service.
Atmospheric Environmental Service (1982 c). Canadian Climate Normals. 1951–1980. Volume 4 – Degree Days. Downsview: Atmospheric Environment Service.
Crown P. H. & Greenlee G. M. (1978). Guidebook for Soils and Land Use in the Edmonton Region, Alberta. 11th Congress of the International Society of Soil Science, Edmonton, Canada.
Dinwoodie G. D. & Juma N. G. (1988). Allocation and microbial utilization of C in two soils cropped to barley. Canadian Journal of Soil Science 68, 495–505.
Froud-Williams R. J. (1988). Changes in weed flora with different tillage and agronomic management systems. In Weed Management in Agroecosystems: Ecological Approaches (Eds Altieri M. A. & Liebman M.), pp. 213–333. Boca Raton, Florida: CRC Press.
Gilson C. (1989). Implications for farmers, food consumers and the general environment. In National Agri-Food Policy Proceedings on Sustainable Agriculture, pp. 5–16. Ottawa: Agriculture Canada.
Government of Alberta and University of Alberta (1969). Atlas of Alberta. Edmonton: University of Alberta Press.
Gu J. (1988). Carbon and nitrogen assimilation, dinitrogen fixation infaba bean (Vicia faba L.) and microbial biomass in soil–plant systems (faba bean, canola, barley and summer fallow) on a Gray Luvisol. MSc thesis, University of Alberta.
Hansson A. C. & Andren O. (1986). Below-ground plant production in a perennial grass ley (Festuca pratensis Huds.) assessed with different methods. Journal of Applied Ecology 23, 657–666.
Izaurralde R. C., Juma N. G. & McGill W. B. (1990). Plant and nitrogen yield of barley–field pea intercrop in cryoboreal-subhumid central Alberta. Agronomy Journal 82, 295–301.
Izaurralde R. C., McGill W. B. & Juma N. G. (1992). Nitrogen fixation efficiency, interspecies N transfer, and root growth in barley–field pea intercrop on a Black Chernozemic soil. Biology and Fertility of Soils 13, 11–16.
Liebman M. & Robichaux R. H. (1990). Competition by barley and pea against mustard: effects on resource acquisition, photosynthesis and yield. Agriculture, Ecosystems and Environment 31, 155–172.
McGill W. B. (1982). Soil Fertility and Land Productivity in Alberta. Report no. ECA82–17/1B16. Edmonton: Environment Council of Alberta.
Mohler C. L. & Liebman M. (1987). Weed productivity and composition in sole crops and intercrops of barley and field pea. Journal of Applied Ecology 24, 685–699.
Odum E. P. (1984). Properties of agroecosystems. In Agricultural Ecosystems: Unifying Concepts (Eds Lowrance R., Stinner B. R. & House G. J.), pp. 5–11. New York: John Wiley & Sons.
Radosevich S. R. & Roush M. L. (1990). The role of competition in agriculture. In Perspectives on Plant Competition (Eds Grace J. B. & Tilman D.), pp. 341–363. San Diego: Academic Press.
Rice E. L. (1984). Allelopathy (2nd edn). Orlando: Academic Press.
Rutherford P. M. & Juma N. G. (1989). Shoot, root, soil and microbial biomass nitrogen dynamics in two contrasting soils cropped to barley (Hordeum vulgare L.). Biology and Fertility of Soils 8, 134–143.
Slinkard A. E. & Blain H. L. (1988). Production of pea, lentil, faba bean and chickpea in North America. In World Crops: Cool Season Food Legumes (Ed. Summerfield R. J.), pp. 1059–1063. Dordrecht: Kluwer Academic Publishers.
Smucker A. J. M., McBurney S. L. & Srivastava S. K. (1982). Quantitative separation of roots from compacted soil profiles by the hydropneumatic elutriation system. Agronomy Journal 74, 500–503.
Trenbath B. R. (1986). Resource use by intercrops. In Multiple Cropping Systems (Ed. Francis C. A.), pp. 57–81. New York: Macmillan Publishing Co.