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Factors Controlling Oxygen Delivery in ALS Hydroponic Systems
Technical Paper
2001-01-2425
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Future large-scale ALS systems may use hydroponic nutrient delivery systems (NDS) for growing staple and salad crops. Crop performance is strongly dependent on dissolved O2 concentration (DOC), pH, and nutrient content of the hydroponic solution. DOC is influenced by solution temperature and flow rate, growth rate of the crop, and the bacterial community present in the solution. Solution temperature determines the solubility of O2 in water, and may increase as solution volume is reduced to minimize overall system mass. Flow may be altered when the height of the solution bathing the root zone is reduced because of dense root mats. These factors may produce anaerobic pockets where N2 losses by denitrification occur, but without yield losses, as long as sufficient O2 to meet root respiration is supplied. Bacterial communities may compete for DOC with the plants when the NDS is used for recycling gray water streams. Aeration experiments were conducted on a hydroponic system to calculate mass transfer coefficients for O2 as a function of flow rate. These coefficients decreased as flow rate increased, and flow rate was more important than solution temperature in controlling DOC. This analysis was used to suggest minimum flow rates and maximum solution temperatures for meeting gray water recycling O2 demand for a crop growing hydroponically at low light. (Supported by NASA’s Fundamental Space Biology NRA program through NCC-0027).
Authors
Citation
Monje, O., Garland, J., and Stutte, G., "Factors Controlling Oxygen Delivery in ALS Hydroponic Systems," SAE Technical Paper 2001-01-2425, 2001, https://doi.org/10.4271/2001-01-2425.Also In
References
- Bu’Lock J. Kristiansen B. 1987 Basic Biotechnology Academic Press, Inc. London, UK
- Garland JL Levine, LH Yorio, NC Adams JL Cook KL 2000 Graywater processing in recirculating hydroponic systems: phytotoxicity, surfactant degradation, and bacterial dynamics Wat. Res. 34 3075 3086
- Lemon ER Wiegand CL 1961 Soil aeration and plant root relations: II Root Respiration. Agron. J. 54 171 175
- Mackowiak CL Garland JL Sager JC 1996 Recycling crop residues for use in recirculating hydroponic crop production Acta Hort. ISHS. 1996 440 19 24
- Monje O 1998 Predicting canopy transpiration rates of hydroponically-grown plant canopies in controlled environments Utah State University Logan, UT
- Scotter DR Thurtell GW Tanner CB 1967 Measuring oxygen uptake by the roots of intact plants under controlled conditions Soil Science 104 374 377