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Langhans, Robert W.
Cornell Emeritus Professor
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Positions
- Prof Emeritus, Horticulture (HORT), College of Agriculture and Life Sciences (CALS)
- Affiliations
- Research
- Publications
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Affiliations
other Cornell affiliations
Research
research overview
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- Plant growth in controlled environments
- Treatment of propagules
- Early growth and selection of seedlings
- Transplanting
- Hydroponics (systems, physical and biological disease control and water quality)
- Vegetative and reproductive growth (particularly the interrelated effects of irradiance, temperature and CO2)
Publications
individual publications
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academic article
- Bioavailability of iron from spinach using an in vitro/human Caco-2 cell bioassay model. Habitation - International Journal for Human Support Research. 10:7-14. 2004
- A model for plant lighting system selection. Transactions of the ASAE. 45:215-221. 2002
- Improvement of spinach germination by seed enhancements. HortScience. 36:979-981. 2001
- Genetic and environmental influences on the nutritive quality of spinach: a NASA ALS candidate crop. American Society for Gravitational and Space Biology Bulletin. 14:25. 2000
- Maintaining constant root relationships in floating hydroponics to study root-shoot relationships. Acta Horticulturae. 507:215-221. 1999
- Winter raspberry production in greenhouses. HortTechnology. 9:13-15. 1999
- Coordinated management of daily PAR integral and carbon dioxide for hydroponic lettuce production. Acta Horticulturae. 456:45-52. 1998
- Electrochemical pH control in hydroponics systems. Acta Horticulturae. 456:275-282. 1998
- Nitrate uptake kinetics in lettuce as influenced by light and nitrate nutrition. Transactions of the ASAE. 41:859-867. 1998
- Shoot and root temperature effects on lettuce growth in a floating hydroponic system. Journal of American Society of Horticultural Science. 123:361-364. 1998
- A microwave powered light source for plant irradiation. Acta Horticulturae. 418:189-194. 1997
- Electric energy consumption and PPF output of nine 400 Watt high pressure sodium luminaires and a greenhouse application of the results. Acta Horticulturae. 418:195-202. 1997
- Hydroponic lettuce production influenced by integrated supplemental light levels in a controlled environment agricultural facility: Experimental results. Acta Horticulturae. 418:45-52. 1997
- Effect of dissolved oxygen concentration on lettuce growth in floating hydroponics. Acta Horticulturae. 440:205-210. 1996
- Greenhouse spinach production in a NFT system. Acta Horticulturae. 440:187-192. 1996
- Considerations in selecting crops for the Human-Rated Life Support System: A linear programming model. Advances in Space Research. 12:233-236. 1995
- Low temperature alters carbohydrate metabolism in Easter lily bulbs. HortScience. 25:463-465. 1990
- Carbohydrate changes in Easter lilies during growth in normal and reduced irradiance environments. Journal of American Society of Horticultural Science. 114:310-315. 1989
- Reduced irradiance affects dry weight partitioning in Easter lily. Journal of American Society of Horticultural Science. 114:306-309. 1989
- Growth and productivity of 'Grand Rapids' lettuce in diurnally fluctuating temperatures and day/night average temperatures. Journal of American Society of Horticultural Science. 110:560-566. 1985
- Plant growth averaging under day/night temperatures. Acta Horticulturae. 174:313-320. 1985
- Passive solar heating applied to commercial greenhouses. Acta Horticulturae. 115:543-551. 1981
- Use of average night temperature for plant growth for potential energy savings. Acta Horticulturae. 115:31-38. 1981
- Disease-free plants via tissue culture propagation. HortScience. 12:149-150. 1977
- Plantlets from petal segments, petal epidermis and shoot tips of the periclinal chimera Chrysanthemum morifolium 'Indianapolis'. American Journal of Botany. 63:729-737. 1976
- Tissue culture propagation of the double petunia. HortScience. 11:35. 1976
- Carnation propagation from shoot tips cultured in liquid medium. HortScience. 10:608-610. 1975
- Chrysanthemum micropropagation. N.Y. Food and Life Sci. Quarterly. 7:37. 1974
- Propagation of Chrysanthemum in vitro. I. Multiple plantlets from shoot tips and the establishment of tissue cultures. Journal of American Society of Horticultural Science. 99:128-132. 1974
- Propagation of Chrysanthemum in vitro. II. Production, growth and flowering of plantlets from tissue cultures. Journal of American Society of Horticultural Science. 99:352-358. 1974
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article
- Greenhouse energy conservation 1987
- The Irristat, a new way to water. GrowerTalks. . 1982
- A Cost Analysis of Two Energy Conservation Methods, Part I 1980
- A cost analysis of two energy conservation methods. Florists' Review. . 1979
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conference paper
- The Investment Analysis of CEA Hydroponic Systems Growing Boston Lettuce. XIVth International Symposium on Horticultural Economics. 269-276. 2012
- Spinach: Nitrate Analysis of an Advanced Life Support (ALS) crop cultured under ALS candidate artificial light sources . SAE, International Controlled Environment Systems proceedings - SAE International. 1999
- Spinach: nitrate analysis of an advanced life support (ALS) crop cultured under ALS candidate artificial light sources. 29th International Conference on Environmental Systems, Society of Automotive Engineers, Inc. ICES99CD, Paper No. 1999-01-2107. 1999
- Research on energy consumption of HID lighting. Proceedings, National Agricultural Demand-Side Management Conference. Syracuse, NY. Oct. 20-22. 1992
- Plant growth under averaged day/night temperatures. Acta Hortic.. 313-320. 1985
- Enhancing Passive Solar Heating of Commercial Greenhouses. Proceedings, American Society of Agricultural Engineers Energy Symposium. 509-512. 1980
- Enhancing passive solar heating of commercial greenhouses. Proceedings, ASAE National Energy Symposium. 509-512. 1980
- Q-Mats as passive solar collectors. Proceedings, 4th Annual Conference on Solar Energy for Heating Greenhouses and Greenhouse-Residence Combinations. 12. 1979
- Experimental results of solar heating a Brace Institute style greenhouse. Proceedings, Solar Energy for Heating Greenhouses and Greenhouse- Residence Combinations. 61-65. 1978
- Experimental results of a greenhouse solar collection and modular gravel storage systems. Proceedings, Conference on Solar Energy for Heating Greenhouse and Greenhouse-Residential Combinations, Cleveland, OH, March 20-23. 256-286. 1977
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document part
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report
- Plant growth and nitrogen uptake, Part I: Beyond the Michaelis-Menten relationship. 1994
- Plant growth and nitrogen uptake, Part II: Effects of light level and nitrate nutrition 1994
- Limiting relative humidity in insulated greenhouses at night 1987
- Plastic covers for glass greenhouses 1979
Background
educational background
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BS, Horticulture, Rutgers University, 1952
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MS, Floriculture/Plant Physiology, Cornell University, 1954
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PhD, Floriculture/Plant Physiology, Cornell University, 1956
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