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Record 10 of 122
Uniformity of environmental conditions and plant growth in a hydroponic culture system for use in a growth room with aerial CO2 control
Author and Affiliation:
Vessey, J. K.(North Carolina State University, Department of Soil Science, Raleigh 27695-7619);
York, E. K.
Henry, L. T.
Raper, C. D. Jr
Raper CD, J. r. [Principal Investigator]
Abstract: A portable system of hydroponic culture was developed that maintained temperature, pH, and nutrient concentrations of circulating nutrient solutions. The hydroponic system is used within a controlled-environment room (CER) for control of aerial environment. The CER was equipped with an auto-calibrating system for atmospheric CO2 control. The control systems for the hydroponic chambers were able to maintain acidity within +/- 0.2 pH units and the temperature with +/- 0.5 degree C. Mixing time for the 200-liter volume of solution within a hydroponic chamber was less than 12 min. The CO2 control system was able to maintain aerial concentrations within +/- 10 ppm CO2 during the light period. The only gradient found to occur within the hydroponic chambers or CER was a slight gradient in aerial temperature along the length of hydroponic chambers. Growth of soybeans [Glycine max (L.) Merr.] was characterized during a 3-week period of vegetative development by leaf number and area, plant dry weight, total N content of plants, and N depletion from the nutrient solution. The growth characteristics among populations for three hydroponic chambers within the CER were not significantly different, and the percent standard errors of means of the measurements within populations from each chamber were nearly all less than 10%. Thus, the uniformity of plant growth reflected the uniformity of environmental conditions.
Publication Date: Jan 01, 1988
Document ID:
20040121819
(Acquired Oct 12, 2004)
Subject Category: LIFE SCIENCES (GENERAL)
Document Type: Journal Article
Publication Information: Biotronics (ISSN 0289-0011); Volume 17; 79-94
Publisher Information: Japan
Contract/Grant/Task Num: NCC2-101
Financial Sponsor: NASA Ames Research Center; Moffett Field CA United States
Description: In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: CARBON DIOXIDE; ENVIRONMENTAL CONTROL; HYDROPONICS; SOYBEANS; VEGETATION GROWTH; ATMOSPHERES; CALIBRATING; CLOSED ECOLOGICAL SYSTEMS; ION CONCENTRATION; LIFE SUPPORT SYSTEMS; NITROGEN; PLANT ROOTS; TEMPERATURE
Other Descriptors: CARBON DIOXIDE/ANALYSIS; ENVIRONMENT, CONTROLLED; HYDROPONICS/INSTRUMENTATION; SOYBEANS/GROWTH & DEVELOPMENT/METABOLISM; ATMOSPHERE; CALIBRATION; EQUIPMENT DESIGN; HYDROGEN-ION CONCENTRATION; NITROGEN/ANALYSIS/METABOLISM; PLANT ROOTS/GROWTH & DEVELOPMENT; SUPPORT, NON-U.S. GOV'T; SUPPORT, U.S. GOV'T, NON-P.H.S; SUPPORT, U.S. GOV'T, P.H.S; TEMPERATURE; NASA DISCIPLINE LIFE SUPPORT SYSTEMS; NASA DISCIPLINE NUMBER 61-10; NASA PROGRAM CELSS; NON-NASA CENTER
Availability Source: Other Sources
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