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Christy T. Carter and Catharine M. Grieve

of saline irrigation waters differing in ionic composition and salinity (2.5, 5, 8, 11, 14 dS·m −1 ) on the growth and production of two varieties of Antirrhinum majus (‘Apollo Cinnamon’ and ‘Monaco Rose’) under greenhouse conditions. Water ionic

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Domenica Scuderi, Francesco Giuffrida, Stefania Toscano, and Daniela Romano

important because the widespread cultivation cycle of this ornamental foliage plant in the Mediterranean region is approximately six months with different thermoradiative growth conditions being intercepted during the year. Therefore, the aim of this study

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Keng Heng Chang, Rung Yi Wu, Geng Peng Chang, Ting Fang Hsieh, and Ren Shih Chung

steadily ( Chang et al., 2010 ; Peng, 2003 ). Nutrient supply is one of the key factors affecting the growth and yield of Anthurium cut flowers ( Chang et al., 2010 ; Dufour and Guérin, 2005 ; Higaki et al., 1992 ; van Herk et al., 1998 ). The optimal

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Soumaila Sanogo, Osama I. El-Sebai, and Robert Sanderson

-flooding conditions on severity of Verticillium wilt, plant growth, and spectral reflectance-based physiological indices of chile pepper. Materials and Methods Inoculum preparation and plant production. An isolate of V. dahliae , recovered from a field

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Brent Tisserat and Amy Stuff

., 1993 ). Glycerol has also been used as a carbohydrate supplement to stimulate algae tissue culture growth ( Baweja and Sahoo, 2009 ; Kaczyna and Megnet, 1993 ; Lawlor et al., 1989 ; Marián et al., 2000 ; Robaina et al., 1990 ). For example, red

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George Kotsiris, Panayiotis A. Nektarios, and Angeliki T. Paraskevopoulou

the increased early spring growth of the compost-amended substrate made it more vulnerable to the summer stressful conditions. These findings are in accordance with the findings of several researchers. Nagase and Dunnett (2011) found that plants

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Claudine Ménard and Blanche Dansereau

The general objective of this project was to study the impact of preharvest growth conditions [supplementary lighting as high-pressure sodium (HPS) or metal halide (MH) lights, and fertilization] on the postharvest quality of greenhouse roses. On 25 Jan. 1991, 288 plants (Rosa × hybrida `Royalty', `After-Glow', and `Obsession') of 3× caliber were planted in pots. A split-split plot experimental design made up of four blocks was used. Light treatments (three) were main plots while fertilization (two) and cultivars (three cultivars; four plants per cultivar) were subplots and sub-sub-plots, respectively. The two fertilization regimes used had respective N: K (in ppm) ratios of 150 N: 300 K (F1) and 300 N: 300 K (F2). Three light treatments [ambient light conditions (control) and ambient light conditions + PPF of 100 μmol·m-2·s-1 supplied by 400-W HPS or MH lamps] were compared. Yields were significantly affected by supplemental light treatments, fertilization, or both regardless of cultivars. Results indicate that stems harvested from HPS and MH light treatments combined with fertilization F1 had a longer vase life than those grown with F2. HPS lamps significantly increased vase life compared to MH. The level of abscisic acid (ABA) was higher under MH than under HPS lamps at time zero (T0), and this was similar for all cultivars. Furthermore, when supplemental light was combined with the F1 fertilization, a lower ABA level was obtained. Low ABA levels were correlated to longer vase life expectancy.

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A. Graifenberg, M. Lipucci di Paola, L. Giustiniani, and O. Temperini

`Terom' globe artichoke (Cynara scolymus L.) plants were propagated vegetatively and grown for 2 years in soil-filled pots in the greenhouse under saline-sodic conditions. Plants were irrigated with water containing from 1 to 10 g NaCl/liter. Growth and yield responses were evaluated with a two-line response model. The aim of this work was to determine the salt tolerance threshold and slope for artichoke yield and growth expressed in terms of electrical conductivity (EC) of irrigation water (ECi) and saturated-soil extract (ECe). The thresholds for yield and plant fresh weight (PFW) were the same—2.7 and 4.8 dS·m-1 for ECi and ECe, respectively. The slopes for yield—14.4% and 10.7% per dS·m-1 for ECi, and ECe—were greater than those for PFW. These data indicate that PFW was less sensitive to soil and water salinity than yield. Plants survived and produced suckers at an ECe of 21.8 dS·m-1, but `Terom' yield was much more sensitive to saline-sodic conditions.

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Douglas A. Hopper and Kevin T. Cifelli

Growth predictions derived from data collected in controlled-environment chambers would be expected to differ from growth responses observed in variable greenhouse conditions. ROSESIM was developed as a dynamic plant growth model based on `Royalty' rose (Rosa hybrida L.) response to 15 unique treatment combinations of photosynthetic photon flux (PPF), day temperature (DT), and night temperature (NT) under constant growth chamber conditions. Regression coefficients for growth equations are read from an external ASCII file, thus permitting coefficients up to a full quadratic model form. Calibration coefficients (CC) were added to ROSESIM to enable predictions to be altered proportionally to permit improved prediction of specific growth characteristics. Numerator and denominator values for CC are adjustable for the first 10 days (initial) growth equations, subsequent growth until anthesis equations, and for the prediction of anthesis. Validation studies were used to set CC values; this enables the model based on growth in controlled environment chambers to be systematically calibrated on site to fit actual growth measured at a specific greenhouse location.

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M. Arias-Gonzalez, J. Farias, S. Guzman, and A. Michel

Our purpose was to evaluate the vegetative growth and flowering of African violet (Saintpauila ionantha) grown in seven soils subtrates under greenhouse conditions. The following were tested: river lime, pine ushers, black clay, oak soil, peatmoss, Canadian peatmoss, and a compost soil. Pots were in a fully randomized experimental design with seven treatments, and four replications was used. A monthly 10N–20P–10K fertilization was applied to potted plants. The study lasted for 135 days, taking data every 15 days on leaf perimeter, length and elasticity of the petiole, plant height, and leaf color. Best vegetative growth was observed with oak and canadian peat moss due to their high capacity to hold water and their very good aeration. Least vegetative growth was observed with black clay, where plants failed to flower. Other substrates did not show differences in plant growth.