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This article in AJ

  1. Vol. 77 No. 3, p. 455-458
    Received: July 9, 1984

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Tripartite Symbiosis of Stylosanthes scabra Vog. Influenced by Soil Fertility Treatments of a Typic Eutrustox1

  1. A. A. C. Purcino and
  2. J. Q. Lynd2



Stylosanthes scabra Vog. is a drought tolerant forage legume with potential for improved pasturage within extensive subhumid, neotropical regions of the world. The objective of these studies was to determine effects of Glomus fasciculatum and soil fertility treatments on growth, nodulation, nitrogenase activity (NA), and nodule cytosol composition of the anthracnose resistant Seca cultivar, inoculated with Rhizobium leguminosarum, and grown on a Typic Eutrustox. The differential endomycorrhizal fungi experiment included levels of Ca3(PO4)2 and KCl. Top growth, nodule weight, and nitrogenase activity increased significantly with mycorrhizal fungi inoculation, P and K soil amendment. The interaction between endomycorrhizal fungi and Ca3(PO4)2 fertilization indicated that G. fasciculatum improved effectiveness of indigenous soil P, but not of P added as Ca3(PO4)2. Nodule cytosol of G. fasciculatum treated plants had higher contents of P, Ca, Mg, and K, but reduced Na. Ca3(PO4)2 fertilization increased cytosol content of P, Ca, and Mg, and significantly decreased Na. Potassium fertilization increased cytosol content of P and K, but decreased Ca, Mg, and Na. These results indicate practical means to attain improved growth and N2 fixation of inoculated S. scabra. with favorable effects from G. fasciculatum colonization when combined with proper soil fertility treatments.

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