ISHS Acta Horticulturae 548: International Symposium on Growing Media and Hydroponics
LIGHT AND CO2 INTERACTION ON PEANUT GROWN IN NUTRIENT FILM TECHNIQUE |
| Authors: | D.G. Mortley, J.H. Hill, D.R. Hileman, C.K. Bonsi, W.A. Hill |
| Keywords: | Arachis hypogaea, hydroponics, photosynthesis, gas exchange |
| Abstract:
The response of 'Georgia Red' peanut (Arachis hypogaea L.) to elevated CO2 of 400 (ambient), 800, 1200, and 1600 µmol mol-1, and photosynthetic photon flux (PPF) of 350 and 700 µmol m-2s-1 was evaluated under controlled conditions using the nutrient film technique (NFT). Growth chamber conditions included a 12 h photoperiod, 28/24°C thermoperiod and 70±5% relative humidity (RH). Plants were grown for 110 days using a modified half-Hoagland nutrient solution with a pH range of 6.4-6.7 and an electrical conductivity of 1200 µS cm-1. Foliage fresh and dry weights increased with both CO2 and PPF, while harvest index (HI) increased with CO2 but was not significantly affected by PPF. Pod fresh weight declined with increased CO2 while pod dry weight increased with PPF. Seed yield was significantly enhanced by both increased carbon dioxide and high PPF. Elevated CO2 did not affect light or CO2 response curves. These results indicate that the level of PPF exerted a greater effect in enhancing peanut growth and seed yield in NFT than did the CO2 concentration. | |
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