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Description: Planting density, or the number of plants per unit area, is an important factor in determining the production capacity of a controlled environment plant factory. The aim of this study was to investigate plant competition by examining how plant growth and productivity are affected by plant density, focusing on two romaine lettuce cultivars (Lactuca sativa var. longifolium ?Valley Heart? and ?Breen?). To compare the performance of these cultivars, four different spacing conditions were implemented in an ebb and flow hydroponic system in the research greenhouse at the McGill?s Macdonald campus. Both square and rectangular spacing conditions were utilized to assess lettuce head and heart formation. Valley Heart had a higher yield in lower spacing conditions than Breen. The formation of heads and hearts varied among cultivars in different spacing conditions. Breen exhibited the potential to form heads and hearts in lower density conditions, while Valley Heart demonstrated a tendency to bolt under these same conditions. These findings contribute to a better understanding of different cultivars? responses to planting density in terms of productivity, providing valuable insight into optimizing lettuce cultivation in hydroponic systems.

Keywords: Controlled environment, hydroponics, romaine lettuce, planting density
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Date: 2023-07-23
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Conference name: CSBE/SCGAB 2023 Annual Conference, Lethbridge, Alberta, 23-26 July 2023.
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Publication type: Text.Abstract
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Coverage: North_America
Language 1: en
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Rights: Canadian Society for Bioengineering
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