The Impact of Some Factors on Nodulation of Acacia spp.

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El Atta, H. A.
Osman, U. E.
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Faculty of Agriculture, University of Khartoum, Shambat, Sudan
The study demonstrated the impact of soil moisture, temperature and soil reaction (pH) on nodulation of six Acacia sPage(s): A.nilotica, A. senegal, A seyal, A.tortilis, A.mellifera and A.albida (Faidherbia albida). Increasing the soil moisture content from 15% to 35% doubled the frequency of nodulation in A. mellifera, A. tortilis, A. nilotica and A. senegal, whereas the frequency of nodulation was tripled in A. seyal and A. albida. The relatively low mean temperature recorded in winter resulted in a considerable reduction in nodules from that of the summer. Mean frequency of nodulation increased from 6.5 nodules in winter to 15.3 nodules in summer. Nodulation of A. nilotica was the most sensitive to soil temperature where mean frequency of nodules/plant increased five times in summer as compared to winter nodulation. Soil reaction proved to be the most inhibitive factor for nodulation. Absolutely no nodules were produced by any plant in acidic soil. Nodulation was minimum in alkaline soil, whereas maximum nodulation occurred in a slightly acidic soil. The study shed the light on the impact of the three most important factors limiting nodulation of Acacia spp.
Page(s): 3 (1), 98-107, 10 Ref
soil moisture, temperature, soil reaction and nodules