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Abstract
Rooted cuttings of Anthemis nobilis, Arctostaphylos uva-ursi; Veronica officinalis and Houttuynia cordata were grown in the greenhouse and in nutrient solutions differing only in pH. The levels of pH were adjusted to 3 to 9 for A. nobilis and A. uva-ursi, to pH 4 to 9 for V. officinalis and to pH 4 to 6 for H. cordata. A. nobilis grew well at pH 4 to 7 but best growth was near pH 5. Arctostaphylos uva-ursi made best growth at pH 4 but not significantly better than at pH 5 to 7. V. officinalis grew well over a wide pH range (4 to 7 inclusive) and plants died gradually at pH 9. For the H. cordata trial a limited number of plants was available and at the imposed pH levels (4, 5 and 6) all plants grew uniformly and well.
Abstract
When inoculum of ectomycorrhizal fungi was added to the rooting medium, the percentage of rooted cuttings and the root volumes on cuttings of bearberry (Arctostaphylos uva-ursi L. Spreng.) and huckleberry (Vaccinium ovatum Parsh) were significantly greater than those of the uninoculated controls. This enhanced rooting occurred before or in the absence of any mycorrhizal association. In some tests, inoculum of one fungus enhanced rooting of one cultivar of bearberry, but not another, suggesting a specific interaction between the cultivar and the fungus. Of the 13 fungi tested, only Thelephora terrestris Ehrh. ex Fr. formed ectendomycorrhizae in the propagation bed, although several others did so under other conditions.