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.
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References
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: 486–497
Anonymous (1988) National atlas of Ethiopia. Ethiopian Mapping Authority. Addis Ababa, Ethiopia
Bell DT (1974) The influence of osmotic pressure in tests for allelopathy. Trans Ill State Acad Sci 67: 312–317
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, India
Bhatt BP and Todaria NP (1990) Studies on the allelopathic effects of some agroforestry tree crops of Garhwal Himalaya. Agroforestry Systems 12: 251–255
Day RW and Quinn GP (1989) Comparisons of treatments after an analysis of variance in ecology. Ecological Monographs 59: 433–463
del Moral R, and Cates RG (1971) Allelopathic potential of the dominant vegetation of western Washington, Ecology 52: 1030–1037
del Moral R and Muller CH (1969) Fog drip: a mechanism of toxin transport fromEucalyptus globulus. Bull. Torrey Bot. Club 96: 467–497
del Moral R and Muller CH (1970) The allelopathic effects ofEucalyptus camaldulensis. Am. Midl. Nat. 83: 254–282
del Moral R, Willis RJ and Ashton DH (1978) Suppression of coastal heath vegetation byEucalyptus baxteri. Aust. J. Bot. 26: 203–219
Florence V (1986) Cultural problems ofEucalyptus as exotics. Comm. For. Rev. 65: 141–163
Harborne JB (1988) Introduction to Ecological Biochemistry, 3rd ed. Academic Press, London
Kohli RK and Singh D (1991) Allelopathic impact of volatile components fromEucalyptus on crop plants. Biologia Plantarum (Praha) 33: 475–483
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 York
Malik RS and Sharma SK (1990) Moisture extraction and crop yield as a function of distance from a row ofEucalyptus tereticornis. Agroforestry Systems 12: 187–195
May EF and Ash EJ (1990) An assessment of the allelopathic potential ofEucalyptus. Aust. J. Bot. 38: 245–254
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)
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.
Pohjonen V (1989) Establishment of fuelwood plantations in Ethiopia. Silva Carelica 14, University of Joensuu, Joensuu, Finland
Pohjonen V and Pukkala T (1990)Eucalyptus globulus in Ethiopian forestry. For. Ecol. Manage. 36: 19–31
Poore MED and Fries C (1985) The ecological effects ofEucalyptus. FAO Forestry Papers 59 FAO, Rome, Italy
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, Germany
Rice EL (1972) Allelopathic effects ofAndropogon virginicus and its persistence in old fields. Am. J. Bot. 59: 752–755
Rice EL (1984) Allelopathy, 2nd ed. Academic Press, New York
Saxena NC (1991) Crop losses and their economic implications due to growing ofEucalyptus on field bunds — a pilot study. Agroforestry Systems 16: 231–245
Singh D, Kohli RK and Saxena DB (1991) Effect ofEucalyptus oil on germination and growth ofPhaseolus aureus Roxb. Plant Soil 137: 223–227
Sokal RR and Rohlf FJ (1981) Biometry, 2nd ed. W.H. Freeman, San Fransisco, California
Stowe L (1979) Allelopathy and its influence on the distribution of plants in an Illinois old field. J. Ecol. 67: 1065–1085
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: 315–319
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Lisanework, N., Michelsen, A. Allelopathy in agroforestry systems: the effects of leaf extracts ofCupressus lusitanica and threeEucalyptus spp. on four Ethiopian crops. Agroforest Syst 21, 63–74 (1993). https://doi.org/10.1007/BF00704926
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DOI: https://doi.org/10.1007/BF00704926