ISHS Acta Horticulturae 418: III International Symposium on Artificial Lighting in Horticulture
HYDROPONIC LETTUCE PRODUCTION INFLUENCED BY INTEGRATED SUPPLEMENTAL LIGHT LEVELS IN A CONTROLLED ENVIRONMENT AGRICULTURE FACILITY: EXPERIMENTAL RESULTS |
| Authors: | A.J. Both, L.D. Albright, R.W. Langhans, R.A. Reiser, B.G. Vinzant |
| Abstract:
Bibb lettuce (Lactuca sativa L., cv. Ostinata) was grown in peat-vermiculite plugs placed in a recirculating hydroponic (NFT) system. Supplemental lighting was used to reach different PPFtarget levels in each of 35 treatments. A second order exponential polynomial was developed to predict DW accumulation for PPFtarget levels between 8 and 22 mol m-2 d-1. Little difference in DW production was noted between lettuce grown under daytime and nighttime lighting. Tipburn was prevented using a fan blowing greenhouse air vertically down onto the lettuce plants. Marketable (150 g FW) lettuce heads were produced in 24 days after transplant while receiving an average PPFintegral of 17 mol m-2 d-1. | |
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