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Filtering by: Creator Kira, M. Remove constraint Creator: Kira, M. Academic Affiliation Crop Science Remove constraint Academic Affiliation: Crop Science Degree Level Doctoral Remove constraint Degree Level: Doctoral

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  • An evaluation of weed interference in rice grown on hydromorphic soils in West Africa

    Creator:
    Diop, Amadou Makhtar
    Abstract:
    Field, screenhouse, and laboratory experiments were conducted to study weed interference in rice grown on hydromorphic soils at the International Institute of Tropical Agriculture (IITA) at Ibadan, Nigeria. Rice and weeds emerged at the same time, 1 week after planting. Weed dry weight was significantly reduced when the crop was...
    Resource Type:
    Dissertation
    Full Text:
    Agriculture (IITA). Special thanks to Andrew Ker and Mrs. M. Beaussart, for their prompt actions in solving

  • The population dynamics and growth of salmonberry (Rubus spectabilis) and thimbleberry (Rubus parviflorus)

    Creator:
    Maxwell, Bruce D.
    Abstract:
    Salmonberry (Rubus spectabilis) and thimbleberry (Rubus parviflorus) are clonal shrub species common to reforestation sites in the Oregon Coast Range. These species have economic importance, because they reduce conifer seedling growth and survival. A population modeling approach was used to facilitate study of the biology of these species and to...
    Resource Type:
    Dissertation
    Full Text:
    (Shinozaki and Kira, 1956; Watkinson, 1980; White, 1980; White and Harper, 1970; Yoda et al., 1963). White

  • Models of a four-species annual weed community : growth, competition, and community dynamics

    Creator:
    Roush, Mary Lynn
    Abstract:
    Models of weed communities aid in the development of weed management strategies and elucidate the processes and mechanisms that regulate plant populations and communities. A conceptual weed community model was developed to organize key regulatory life-history processes. Specific investigations focused on the processes of plant growth and competition, and relationships...
    Resource Type:
    Dissertation
    Full Text:
    -CROP ASSOCIATIONS: INTENSITY OF COMPETITION. M. L. Roush and S.R. Radosevich ABSTRACT Competition