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Phasic temperature and photoperiod control for soybean using a modified CROPGRO model.

J Cavazzoni1, T Volk, B Bugbee

  • 1Department of Bioresource Engineering, Rutgers, The State University of New Jersey, New Brunswick 08901-8500, USA. cavazzon@bioresource.rutgers.edu

Life Support & Biosphere Science : International Journal of Earth Space
|September 7, 2001
PubMed
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Optimizing soybean production for space requires advanced life support. Combining phased temperature and photoperiod control can increase soybean seed yield by 15% compared to current experimental methods.

Area of Science:

  • Agricultural Science
  • Plant Physiology
  • Biotechnology

Background:

  • Optimizing soybean production is crucial for NASA's Advanced Life Support program.
  • Elevated CO2 levels (1100 micromol mol-1) were used in baseline soybean experiments at Utah State University (USU).

Purpose of the Study:

  • To optimize soybean production using a modified CROPGRO model for phased temperature and photoperiod control.
  • To evaluate the potential of combined temperature and photoperiod phasing to enhance soybean seed yield.

Main Methods:

  • A modified CROPGRO model was employed to simulate soybean growth under different temperature and photoperiod regimes.
  • Baseline simulations were established using experimental data from soybean temperature studies at elevated CO2.
Keywords:
NASA Discipline Life Support SystemsNon-NASA Center

Related Experiment Videos

Main Results:

  • Phasic temperature control alone showed minimal improvement in seed yield rate over existing experimental values.
  • Simulations combining phased temperature (two phases) and photoperiod (two phases) indicated a potential 15% increase in seed yield (g m-2 day-1).
  • Extending photoperiods during later crop stages may increase seed mass by lengthening grain fill duration.

Conclusions:

  • Combined phased temperature and photoperiod control offers a practical strategy to enhance soybean yield for space agriculture.
  • Careful management of photoperiod timing and duration is essential to avoid negative impacts on seed number and photosynthesis at elevated CO2.