Agroforestry Systems

, Volume 21, Issue 1, pp 63–74 | Cite as

Allelopathy in agroforestry systems: the effects of leaf extracts ofCupressus lusitanica and threeEucalyptus spp. on four Ethiopian crops

  • N. Lisanework
  • A. Michelsen
Article

Abstract

The potential allelopathic effect ofCupressus lusitanica, Eucalyptus globulus, E. camaldulensis andE. saligna on seed germination, radicle and seedling growth was investigated with four crops:Cicer arietinum (chickpea),Zea mays (maize),Pisum sativum (pea) andEragrostis tef (teff). Aqueous leaf extracts of all the tree species significantly reduced both germination and radicle growth of the majority of the crops mostly starting from concentrations of 1% or 2.5%. The shoot and root dry weight increase of the crops was significantly reduced after 10 weeks treatment with leaf extracts. Among the four crops, chickpea and teff were most susceptible with respect to germination, and teff with respect to growth. From the overall data the leaf extracts of the four tree species can be arranged according to increasing allelopathic potential:C. lusitanica, E. globulus, E. saligna andE. camaldulensis. It is suggested that the planting ofE. camaldulensis andE. saligna in integrated land use systems should be minimized, whereas the use ofC. lusitanica andE. globulus seems less environmentally damaging in this respect.

Key words

Cicer arietinum Eragrostis tef Pisum sativum tropical tree plantations Zea mays 

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References

  1. Abdul-Wahab AS and Rice EL (1967) Plant inhibition by Johnson grass and its possible significance in old-field succession. Bull Torrey Bot Club 94: 486–497Google Scholar
  2. Anonymous (1988) National atlas of Ethiopia. Ethiopian Mapping Authority. Addis Ababa, EthiopiaGoogle Scholar
  3. Bell DT (1974) The influence of osmotic pressure in tests for allelopathy. Trans Ill State Acad Sci 67: 312–317Google Scholar
  4. Bhaskar V and Dasappa (1986) Ground flora inEucalyptus plantations of different ages. In: Sharma JK, Nair CTS, Kedharnath S and Konda S, eds,Eucalyptus in India — Past, Present and Future, pp 213–224. Kerala Forest Research Institute, Peechi, IndiaGoogle Scholar
  5. Bhatt BP and Todaria NP (1990) Studies on the allelopathic effects of some agroforestry tree crops of Garhwal Himalaya. Agroforestry Systems 12: 251–255Google Scholar
  6. Day RW and Quinn GP (1989) Comparisons of treatments after an analysis of variance in ecology. Ecological Monographs 59: 433–463Google Scholar
  7. del Moral R, and Cates RG (1971) Allelopathic potential of the dominant vegetation of western Washington, Ecology 52: 1030–1037Google Scholar
  8. del Moral R and Muller CH (1969) Fog drip: a mechanism of toxin transport fromEucalyptus globulus. Bull. Torrey Bot. Club 96: 467–497Google Scholar
  9. del Moral R and Muller CH (1970) The allelopathic effects ofEucalyptus camaldulensis. Am. Midl. Nat. 83: 254–282Google Scholar
  10. del Moral R, Willis RJ and Ashton DH (1978) Suppression of coastal heath vegetation byEucalyptus baxteri. Aust. J. Bot. 26: 203–219Google Scholar
  11. Florence V (1986) Cultural problems ofEucalyptus as exotics. Comm. For. Rev. 65: 141–163Google Scholar
  12. Harborne JB (1988) Introduction to Ecological Biochemistry, 3rd ed. Academic Press, LondonGoogle Scholar
  13. Kohli RK and Singh D (1991) Allelopathic impact of volatile components fromEucalyptus on crop plants. Biologia Plantarum (Praha) 33: 475–483Google Scholar
  14. Leather GR and Einhellig FA (1986) Bioassays in the study of allelopathy. In: Putnam AR and Tan CH, eds, The Science of Allelopathy, pp 133–145, John Wiley & Sons, New YorkGoogle Scholar
  15. Malik RS and Sharma SK (1990) Moisture extraction and crop yield as a function of distance from a row ofEucalyptus tereticornis. Agroforestry Systems 12: 187–195Google Scholar
  16. May EF and Ash EJ (1990) An assessment of the allelopathic potential ofEucalyptus. Aust. J. Bot. 38: 245–254Google Scholar
  17. Michelsen A (1993) Growth improvement of Ethiopian acacias by addition of VA mycorrhizal fungi or roots of native plants to non-sterile nursery soil. For. Ecol. Manage. (in press)Google Scholar
  18. Michelsen A, Lisanework N and Friis I (submitted) Impacts on soil fertility, shoot and root growth, nutrient utilization and mycorrhizal colonization by tree plantations in the Ethiopian highland. For. Ecol. Manage.Google Scholar
  19. Pohjonen V (1989) Establishment of fuelwood plantations in Ethiopia. Silva Carelica 14, University of Joensuu, Joensuu, FinlandGoogle Scholar
  20. Pohjonen V and Pukkala T (1990)Eucalyptus globulus in Ethiopian forestry. For. Ecol. Manage. 36: 19–31Google Scholar
  21. Poore MED and Fries C (1985) The ecological effects ofEucalyptus. FAO Forestry Papers 59 FAO, Rome, ItalyGoogle Scholar
  22. Poschen-Eiche P (1987) The Application of Farming Systems Research to Community Forestry. A Case Study in the Hararge Highlands, Eastern Ethiopia. Verlag Josef Margraf, Weikersheim, GermanyGoogle Scholar
  23. Rice EL (1972) Allelopathic effects ofAndropogon virginicus and its persistence in old fields. Am. J. Bot. 59: 752–755Google Scholar
  24. Rice EL (1984) Allelopathy, 2nd ed. Academic Press, New YorkGoogle Scholar
  25. Saxena NC (1991) Crop losses and their economic implications due to growing ofEucalyptus on field bunds — a pilot study. Agroforestry Systems 16: 231–245Google Scholar
  26. Singh D, Kohli RK and Saxena DB (1991) Effect ofEucalyptus oil on germination and growth ofPhaseolus aureus Roxb. Plant Soil 137: 223–227Google Scholar
  27. Sokal RR and Rohlf FJ (1981) Biometry, 2nd ed. W.H. Freeman, San Fransisco, CaliforniaGoogle Scholar
  28. Stowe L (1979) Allelopathy and its influence on the distribution of plants in an Illinois old field. J. Ecol. 67: 1065–1085Google Scholar
  29. Wardle DA, Nicholson KS and Ahmed M (1992) Comparison of osmotic and allelopathic effects of grass leaf extracts on grass seed germination and radicle elongation. Plant Soil 140: 315–319Google Scholar

Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • N. Lisanework
    • 1
  • A. Michelsen
    • 2
  1. 1.Biology DepartmentAddis Ababa UniversityAddis AbabaEthiopia
  2. 2.Institute of Plant EcologyUniversity of CopenhagenCopenhagen KDenmark

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