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- Author or Editor: Becky R. Hughes x
- Journal of the American Society for Horticultural Science x
Abstract
Chrysanthemum morifolium Ramat. cvs. White Marble and Improved Mefo were rooted and grown in cell paks for 34 days under ambient light plus: photoperiodic incandescent night-break lighting 2μE (m−2s−1); 64 μE m−2s−1 high pressure sodium (HPS) dusk to dawn lighting; or 126 μE m−2s−1 HPS dusk to dawn lighting. Container-grown chrysanthemums were fertilized with either 200 ppm N, 86 ppm P and 166 ppm K or 300 ppm N, 129 ppm P and 249 ppm K with every irrigation. After 34 long days these plants were transplanted into raised beds, immediately given short day conditions, and treated as a normal commercial crop. The container-grown treatments were compared to each other and to a bench-grown control which received a total of 48 long days. Supplemental HPS lighting increased the net assimilation rate (NAR), plant dry weight, and height of ‘White Marble’ chrysanthemums after 4 weeks. Increased fertility increased NAR and dry weight in the supplemental light treatment but not in the ambient light treatment. Results were less obvious for “Improved Mefo’. The container-grown treatments were ready for harvest 14 to 22 days before the controls. In both cultivars the high light-high fertility treatment was superior to the other container-grown treatments. The ‘White Marble’ high light-high fertility treatment produced higher quality chrysanthemums than the control, while the same ‘Improved Mefo’ treatment produced chrysanthemums slightly inferior to the control.
Abstract
Leaflet length and width were used to calculate leaflet area, leaf area and total leaf area per plant for 3-year-old American ginseng, Panax quinquefolius L. grown in growth chambers. On the basis of correlation and regression analyses the product of leaflet length and width (LW) was chosen as the independent variable, but leaflet width squared (W2) also proved satisfactory. Although leaflet shape varied somewhat with position, one regression equation was found suitable. Assuming that the Y-intercept was equal to zero had little effect on the coefficient of determination (R2) or the standard error of estimation so the following equations were chosen to determine leaflet, leaf and total leaf area, respectively: A = 0.66 LW (R2 = 98.92%, ± 0.75 cm2); A = Σ0.67 LW (R2 = 98.36%, ± 2.49 cm2); A = Σ0 .67 LW (R2 = 97.36%, ± 7.83 cm2). The relationship between leaflet LW and total leaf area per plant was used to determine leaf area per plant and LAI for commercial ginseng crops 1, 2, 3, and 4 years old.
Abstract
Supplemental high pressure sodium (HPS) night lighting during propagation increased early growth and rooting of Chrysanthemum morifolium Ramat. cv. White Marble cuttings planted in October, and early growth only in cuttings planted in January. The results depended on the ambient light conditions and the level of supplemental HPS irradiance. Flower quality was enhanced by the supplemental light treatments only in the October plantings. Improving ambient light conditions as the crop developed apparently compensated for poor light conditions during the rooting period of the January planting.