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Ryan W. Dickson and Paul R. Fisher

effect in both substrate and hydroponic conditions during the vegetative growth stage. Species pH effect was quantified as mEq of root zone acidity–basicity per gram dry weight gain per plant in substrate and hydroponics. For plants grown in substrate

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Hillel Soffer and David W. Burger


Cuttings of Ficus benjamina L. and Chrysanthemum × morifolium(Dendranthema grandiflora tzvelev.) were rooted in aero-hydroponics to study the effect of dissolved oxygen concentrations in the range of 8 mg·liter. (ambient saturation) to 0 mg·liter−1. The results of this study indicate that dissolved oxygen is essential to root formation and root growth. Woody (Ficus) and herbaceous (Chrysanthemum) cuttings responded similarly. Lowering the dissolved oxygen concentration increased the time required to form adventitious roots, reduced rooting percentages, reduced numbers of roots formed per cutting, and reduced average root lengths. Comparisons between stirred and unstirred water suggested the development of an area of depleted oxygen concentration (boundary layer) at the stem-water interface on cuttings immersed in unstirred water. Cuttings in water stirred constantly rooted sooner and formed more roots than did those in unstirred water. Maximum rooting occurred in misted (high dissolved oxygen concentrations) sections of cuttings suspended in the aero-hydroponics chambers. Chemical name used: potassium salt of lH-indole-3-butyric acid (K-IBA).

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Jong-Seok Park and Kenji Kurata

effect of microbubbles on the growth of leaf lettuce in a deep flow technique (DFT) hydroponics culture system. To understand the effects of microbubbles on plant growth, we compared lettuce treated with macrobubbles generated by aquarium aeration stones

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Merle H. Jensen

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Matthew A. Cutulle, H. Tyler Campbell, Monica Farfan, and Phillip A. Wadl

for screening stress tolerance in different plants, demanding lower resources, materials, and time than field trials ( Sakhanokho and Kelley, 2009 ). Hydroponics has been used to access herbicide tolerance or resistance in weeds ( Brosnan et al., 2014

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Elisa Solis-Toapanta, Andrei Kirilenko, and Celina Gómez

trending topic among online communities, which are significant drivers for this growing market segment ( Garden Media Group, 2019 ; Thij et al., 2016 ). As of Nov. 2019, indoor gardening subreddits such as r/UrbanFarming, r/Hydroponics, and r

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Martin P.N. Gent

according to RGR? To what extent are these determined by irradiance or time of year and by conditions of the nutrient solution in hydroponics? Irradiance is the primary factor affecting RGR ( Gent, 2014 ). However, a function of light intercepted by the crop

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Joshua K. Craver and Kimberly A. Williams

greenhouse industry is shifting away from solely producing herbaceous ornamental crops and integrating or replacing these crops with vegetables and herbs. For this reason, hydroponics and other systems using recirculated nutrient solution have become an

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Joshua D. Butcher, Charles P. Laubscher, and Johannes C. Coetzee

anaerobic respiration. Oxygenation in Hydroponics Plant growth has been shown to increase when irrigated with additional dissolved oxygen (DO) in the solution ( Soffer et al., 1990 ), therefore, in hydroponics it is important that oxygen is dissolved in the

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Vincent Martineau, Mark Lefsrud, Most Tahera Naznin, and Dean A. Kopsell

level for being considered as a replacement to HPS lamps in hydroponics growth environments. LED lamps are anticipated to replace HPS lamps in most applications as a result of their reduced electricity consumption, improved quality of light, and the