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Soil Science Society of America Journal Abstract -

Interactions of Phosphorus Availability, Mycorrhizae, and Soil Fumigation on Coniferous Seedlings1


This article in SSSAJ

  1. Vol. 34 No. 2, p. 314-318
    Received: Aug 27, 1969
    Accepted: Oct 8, 1969

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  1. Gray S. Henderson and
  2. E. L. Stone Jr.2



Factorial experiments under nursery and greenhouse conditions were used to study P uptake and growth of coniferous seedlings. Vapam, Trizone, and methyl bromide effectively eliminated mycorrhizal fungi from the rooting zone of tree seedlings and thus afforded a means of studying mycorrhizae in a relatively natural environment. Growth and P content of nonmycorrhizal seedlings grown in fumigated soil without P fertilization were less than for any other treatment; this is attributed to absence of mycorrhizae. Beinoculation with mycorrhizal roots or soil, or high rates of P fertilization without inoculation prevented the reduced P uptake and poor growth caused by fumigation alone. Fumigation followed by both inoculation and P fertilization resulted in the largest seedlings and greatest P uptake. Greater absorbing surface, together with high P concentrations, presumably accounts for the greater uptake and corresponding growth increase.

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