The role of plant size and nutrient concentrations in associations between Medicago and Rhizobium and/or Glomus
2000
Goicoechea, N. | Antolin, M.C. | Sanchez-Diaz, M. (Universidad de Navarra, Pamplona (Spain). Dept. de Fisiologia Vegetal)
The aim of this research was to carry out a critical study of the method of obtaining size equivalence between non-symbiotic alfalfa and alfalfa associated with Glomus and/or Rhizobium by applying fixed addition rates of nutrients to the non-symbiotic controls. Although similar size was achieved among some treatments at harvest, shoot growth over time and nutrient concentrations in tissues differed, indicating that growth equivalence did not mean functional equivalence. A second experimental design was performed taking into account the establishment of microsymbionts for determining the adequate moment to add supplemental phosphorus and/or nitrogen. It included four treatments: a) double symbiotic plants; b) plants inoculated with Rhizobium only; c) plants inoculated with Glomus only, and d) non-inoculated plants. Great similarity in terms of plant growth and nutrient contents in tissues were obtained.
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