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Dual inoculation of Pisum sativum with Rhizobium leguminosarum and Penicillium bilaji
Authors:J Downey  Ch van Kessel
Institution:(1) Department of Soil Science, University of Saskatchewan, S7N OWO Saskatoon, Saskatchewan, Canada
Abstract:Summary To investigate the effect of single versus dual inoculation of peas (Pisum sativum L.) with Rhizobium leguminosarum biovar viceae and Penicillium bilaji (a soil fungi capable of solubilizing soil P) on N2 fixation an experiment was carried out under controlled conditions. A sandy loam soil was selected which contained low levels of available N and P. P fertilizer Ca(H2PO4)2] and P. bilaji significantly increased dry matter production. Peas inoculated with R. leguminosarum showed only a small increase in dry matter, but the additional application of P significantly increased the yield. The total N accumulation was highly dependent on the presence of R. leguminosarum. Using the delta15N method for estimating N2 fixation, the highest level of N2-fixing activity was observed in peas inoculated with R. leguminosarum and fertilized with inorganic P. Dual inoculation of peas with P. bilaji and R. leguminosarum significantly decreased the amount of N2 fixed. Total P uptake was solely dependent on the P fertilizer.
Keywords:N2 fixation  Rhizobium  P-releasing fungi  Pea  delta15N" target="_blank">gif" alt="delta" align="BASELINE" BORDER="0">15N  Pisum sativum  Rhizobium leguminosarum  Penicillium bilaji
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