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  • Author or Editor: D. H. Marx x
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A greenhouse study was conducted to determine the effects of soil pH and Pisolithus tinctorius (Pers.) Coker and Couch (Pt) ectomycorrhizae on pecan seedlings [Carya illinoensis (Wangenh.) C. Koch]. Seedlings inoculated with Pt had increased plant dry weights and mineral content when compared to noninoculated seedlings. P. tinctorius ectomycorrhizae increased shoot concentrations of N, P, and Cu and root concentrations of N and Cu. Inoculated seedlings also had greater total plant uptake of N, P, K, Ca, Mg, Cu, and Mn than noninoculated seedlings. P. tinctorius ectomycorrhizal development was sensitive to soil pH with greater Pt development at pH 5.5 than at 6.5. The percentage of roots infected by Pt increased from 22% to 44% as soil pH decreased from 6.5 to 5.5. Plant dry weight and N and K content also increased with decreasing pH, but there were no significant interaction affects due to Pt and soil pH. There was a three-way interaction between soil pH, Pt, and Zn fertilization for tissue Zn levels. Total plant Zn was not affected by Pt infection under conditions of high available soil Zn, but Pt did increase plant Zn under low soil Zn availability.

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