Physics
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994adspr..14..277l&link_type=abstract
Advances in Space Research, Volume 14, Issue 11, p. 277-280.
Physics
1
Scientific paper
Effects of relative humidity, light intensity and photoperiod on growth of `Ga Jet' and `TI-155' sweetpotato cultivars, using the nutrient film technique (NFT), have been reported. In this study, the effect of ambient temperature regimes (constant 28°C and diurnal 28:22°C day:night) and different CO2 levels (ambient, 400, 1 000, and 10 000 μL/L-400, 1 000 and 10 000 ppm) on growth of one or both of these cultivars in NFT are reported. For a 24-h photoperiod, no storage roots were produced for either cultivar in NFT when sweetpotato plants were grown at a constant temperature of 28°C. For the same photoperiod, when a 28:22°C diurnal temperature variation was used, there were still no storage roots for `TI-155' but the cv. `Ga Jet' produced 537 g/plant of storage roots. For both a 12-h and 24-h photoperiod. `Ga Jet' storage root fresh and dry weight tended to be higher with a 28:22°C diurnal temperature variation than with a constant 28°C temperature regime. Preliminary results with both `Ga Jet' and `TI-155' cultivars indicate a distinctive diurnal stomatal response for sweetpotato grown in NFT under an ambient CO2 level. The stomatal conductance values observed for `Ga Jet' at elevated CO2 levels indicated that the difference between the light- and dark-period conductance rates persisted at 400, 1 000, and 10 000 μL/L.
Bonsi C. K.
David Peter P.
Hill W. A.
Loretan Philip A.
Mackowiak C. L.
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