AbstractEffects 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.


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    Title :

    Effects of several environmental factors on sweetpotato growth


    Contributors:
    Loretan, P.A. (author) / Bonsi, C.K. (author) / Mortley, D.G. (author) / Wheeler, R.M. (author) / Mackowiak, C.L. (author) / Hill, W.A. (author) / Morris, C.E. (author) / Trotman, A.A. (author) / David, P.P. (author)

    Published in:

    Advances in Space Research ; 14 , 11 ; 277-280


    Publication date :

    1994-01-01


    Size :

    4 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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