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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

Journal Article

Optimization of temperature and light, and cultivar selection for the production of high-quality head lettuce in a closed-type plant factory  [2019]

Lee, Ru Ji; Bhandari, Shiva Ram; Lee, Gongin; Lee, Jun Gu;

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Two separate experiments were conducted to identify suitable cultivars, to optimize light and temperature, and to understand the heading process in order to produce high-quality crisphead lettuce (Lactuca sativa L.) in a closed production environment. Three commercial crisphead lettuce cultivars (‘Adam’, ‘Manchu’, and ‘Sensation’) were grown on deep flow technique beds in a closed-type plant factory under three different fluorescent light intensities [150, 200, and 250 µmol m⁻² s⁻¹ photosynthetic photon flux (PPF)] and two temperature conditions. The plants were grown until 60 days after transplantation (DAT) under the high [22/18 °C (0–30 DAT) → 18/16 °C (30–60 DAT)] and low [18/16 °C (0–30 DAT) → 18/14 °C (30–60 DAT)] temperature conditions, with 50 ± 10% relative humidity and a 12-h day length. Growth parameters, including head formation rate and tip burn incidence, were measured in all experiments. All cultivars exhibited significantly higher growth rates in the 250 µmol m⁻² s⁻¹ light intensity compared to lower light intensities under both temperature conditions, and showed a cultivar-specific difference in the growth pattern at different light intensities. Our cultivation trials suggest that ‘Sensation’ is ideal for production in closed-type plant factory systems at 250 µmol m⁻² s⁻¹ PPF due to its stable head formation and superior head quality. Under the high temperature condition, head formation was only observed in two cultivars, ‘Sensation’ and ‘
Adam’, while all cultivars showed head formation in the low temperature condition. The initiation of head formation began at the 8–10 true-leaf stage around 20 DAT, and then apparent head formation was observed around 30 DAT, followed by an increase of head density until harvest (60 DAT). Tip burn symptoms were observed throughout the experiment, with higher values in the high temperature condition. The results of our study suggest that good head formation can be achieved under high light intensities (≥ 200 µmol m⁻² s⁻¹ PPF) and low temperature [18/16 °C (0–30 DAT) → 18/14 °C (30–60 DAT)] in crisphead lettuce grown in a closed-type plant factory.
From the journal
Horticulture, environment and biotechnology
ISSN : 2211-3452

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2019
Volume:
60
Issue:
2
Extent:
207-216
Publisher:
Springer Singapore
All titles:
"Optimization of temperature and light, and cultivar selection for the production of high-quality head lettuce in a closed-type plant factory"@eng
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Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2019
Volume:
60
Issue:
2
Extent:
207-216
Publisher:
Springer Singapore
All titles:
"Optimization of temperature and light, and cultivar selection for the production of high-quality head lettuce in a closed-type plant factory"@eng