Journal of Applied Phycology

, Volume 2, Issue 3, pp 269–272 | Cite as

Effect of seaweed concentrate on the growth and mineral nutrition of nutrient-stressed lettuce

  • I. J. Crouch
  • R. P. Beckett
  • J. van Staden


The effects of the seaweed concentrate ‘Kelpak’ on the growth and mineral nutrition of lettuce plants grown under conditions of varying nutrient supply were investigated. Kelpak significantly increased the yield and the concentration and amounts of Ca, K and Mg in the leaves of lettuce receiving an adequate supply of nutrients, but had little effect on nutrient stressed plants. Results are discussed in relation to the physiological mechanisms that have been proposed to explain the beneficial effects of seaweed concentrate on plants.

Key words

lettuce nutrient stress seaweed concentrate 


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Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • I. J. Crouch
    • 1
  • R. P. Beckett
    • 1
  • J. van Staden
    • 1
  1. 1.UN/FRD Research Unit for Plant Growth and Development, Department of BotanyUniversity of NatalPietermaritzburgSouth Africa

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