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      Permanent link:
      https://www.ias.ac.in/article/fulltext/plnt/089/03/0161-0168

    • Keywords

       

      Salvinia molesta ; salinity tolerance; growth rates; weed control

    • Abstract

       

      InSalvinia molesta Mitchell growth rate was uniform among the various size groups except in the proliferating floating stage in which it was faster. An average increase of about 25% weight occurred during a period of 5 days under laboratory condition. In general fresh set of leaves developed at an average interval of 4·5 days but this period may vary under different environmental conditions. In low salinities the growth of the fern showed retardation while in higher salinities it underwent complete destruction. Salinities above 7‰ was harmful for the weed while it completely withered in salinities 11‰ and above. Minimum period required for the total withering of the weed in salinities 34‰ and 11‰ were 30 min and 20 h respectively. These results are of value in the effective control of the weed by flushing them into brackish water lakes during monsoon.

    • Author Affiliations

       

      O Divakaran1 M Arunachalam1 N Balakrishnan Nair1

      1. Department of Aquatic Biology and Fisheries, University of Kerala, Trivandrum - 695 007, India
    • Dates

       
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