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- Author or Editor: J. L. Eggens x
- Journal of the American Society for Horticultural Science x
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
The effectiveness of ethephon for reducing the growth of annual bluegrass (Poa annua L.), when grown as single plants in pot culture in the greenhouse or outdoors, and within a Kentucky bluegrass (Poa pratensis L.) sod, was evaluated. Ethephon reduced the growth of annual bluegrass more than that of Kentucky bluegrass. Concentration was more important in reducing plant spread than the number of applications. Ethephon applied to field grown turf reduced the leaf area per tiller of annual bluegrass but not Kentucky bluegrass. Leaves per tiller and the shoot dry weight of field grown Kentucky bluegrass increased with increasing ethephon rates compared to nontreated plots. Although significant growth retardation occurred for both species in pot culture, only Kentucky bluegrass canopy height decreased in the field with increasing ethephon rates. Decreased Kentucky bluegrass canopy height resulted from reduced sheath length. Chemical names used: (2-chloroethyl) phosphonic acid (ethephon).