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Plant and Soil

, Volume 137, Issue 1, pp 145–149 | Cite as

Assessment and attempt to explain the high performance of Azolla in subdesertic tropics versus humid tropics

  • T. de Waha Baillonville
  • H. F. Diara
  • I. Watanabe
  • P. Berthet
  • C. Van Hove
Article

Abstract

Two similar experiments aimed at selecting performingAzolla strains at Richard Toll, Senegal (subdesertic tropics) and Los Baños, Philippines (humid tropics) show that annual mean productivity of the tested strains is higher in the first site than in the second, the best ecotypes in Senegal producing more than twice as much as in the Philippines.

Attempts to explain these differences by climatic or interaction of climatic variables (in the range explored) are unsuccessful. Further analyses are thus needed to understand the reasons, climatic or other, responsible for the different behaviour ofAzolla under the two studied ecologies.

Key words

Azolla cluster covulation natural conditions productivity 

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References

  1. de Waha Baillonville T, Diara H F, Godard P and Van Hove C 1991 A standardized methodology to measureAzolla biomass under natural conditions. International Rice Commission Newsletter June 1991.Google Scholar
  2. Lumpkin I and Bartholomew D P 1986 Predictive models for the growth response of eightAzolla accessions to climatic variables. Crop Science 26, 107–111.Google Scholar
  3. SAS 1985 SAS User's Guide: Statistics, Version 5 Ed. SAS Institute Inc. Cary, NC, 956 p.Google Scholar
  4. Van Hove C, de Waha Baillonville T, Diara H F, Godard P, Mai Kodomi Y and Sanginga N 1987Azolla collection and selection.In Azolla Utilization, pp 77–87. IRRI. Los Baños, Philippines.Google Scholar
  5. Van Hove C, Diara H F and Godard P 1983Azolla en Afrique de l'Ouest-in West Africa. Ed. C Van Hove. Ed Oleffe, Gourt St Etienne, Belgium, 56 p.Google Scholar

Copyright information

© Kluwer Academic Publishers 1991

Authors and Affiliations

  • T. de Waha Baillonville
    • 1
  • H. F. Diara
    • 2
  • I. Watanabe
    • 3
  • P. Berthet
    • 1
  • C. Van Hove
    • 1
  1. 1.Laboratoire de Physiologie VégétaleUniversité Catholique de LouvainLouvain-la-NeuveBelgium
  2. 2.West Africa Rice Development AssociationSaint LouisSenegal
  3. 3.Soil Microbiology DivisionInternational Rice Research InstituteManilaPhilippines

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