Plant and Soil

, Volume 117, Issue 1, pp 75–83 | Cite as

Effects of kelp (Macrocystis integrifolia andEcklonia maxima) foliar applications on bean crop growth and nitrogen nutrition under varying soil moisture regimes

  • W. D. Temple
  • A. A. Bomke
  • R. A. Radley
  • F. B. Holl


A greenhouse experiment was designed to test the effects of two kelp(Macrocystis integrifolia andEcklonia maxima) concentrates, when prepared as foliar sprays, upon bean (Phaseolus vulgaris) growth and N nutrition under three soil moisture regimes. Plant growth and developmental responses in this greenhouse experiment have demonstrated the effectiveness of the two kelp foliar sprays as plant growth regulating substances. Bean growth and developmental responses to the kelp foliar spray treatments were dependent upon the soil moisture regime to which they have been subjected. Although the two kelp foliar sprays had varying and sometimes contrasting effects on bean growth and N nutrition, which were dependent on the soil moisture treatment, their developmental effects upon the number of nodes, shoot/root ratio, leaf area ratio and specific leaf area were quite similar. A soybean callus bioassay demonstrated the presence of cytokinin-like substances and a callus growth antagonist in the kelp concentrate. Increasing dilution of the kelp concentrate disproportionately reduced the callus growth antagonist relative to the growth promoting or cytokinin-like activity.

Key words

cytokinin foliar spray kelp concentrates nitrogen nutrition Phaseolus vulgaris soil moisture stress 


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Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • W. D. Temple
    • 1
  • A. A. Bomke
    • 1
  • R. A. Radley
    • 1
  • F. B. Holl
    • 1
  1. 1.Departments of Soil ScienceUniversity of British ColumbiaVancouverCanada

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