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Increasing plant productivity in closed environments with inner canopy illumination
1Department of Horticultural Science, University of Guelph, Canada.
Life Support & Biosphere Science : International Journal of Earth Space
|September 7, 2001
Summary
Enhancing plant productivity for space colonization requires efficient cultivation. Supplementing light within dense soybean canopies significantly boosted CO2 assimilation, increasing biomass production.
Area of Science:
- Plant physiology
- Space agriculture
- Biomass production
Background:
- Space colonization necessitates efficient plant-based life support systems.
- Dense plant canopies suffer from light penetration issues, reducing overall productivity.
- Inner canopy shading leads to respiratory carbon losses, hindering biomass gain.
Purpose of the Study:
- To investigate methods for increasing plant productivity in confined spaces.
- To optimize light delivery within dense plant canopies for enhanced photosynthesis.
- To assess the impact of inner canopy illumination on soybean crop yield.
Main Methods:
- Utilizing microwave-powered lights coupled with optical lighting film in glass tubes.
- Delivering supplemental light to the inner canopy of soybean crops.
- Measuring CO2 assimilation to quantify productivity gains.
Main Results:
- Inner canopy illumination increased productivity by 23-87% in dense soybean canopies (LAI ~6).
- Supplemental lighting utilized previously unused photosynthetic capacity within the lower canopy.
- Optimized light spectrum and delivery improved overall carbon gain.
Conclusions:
- Supplemental inner canopy lighting is a viable strategy to enhance crop productivity in space-limited environments.
- This method effectively overcomes light limitations in dense plant stands.
- Increased CO2 assimilation translates to higher biomass production, crucial for life support systems.