Abstract
A modified CROPGRO model is applied to phasic temperature and photoperiod control in order to optimize soybean production for NASA's program in Advanced Life Support. Baseline model simulations were established using data from soybean temperature experiments conducted at elevated CO2 levels (1100 micromol mol-1) at Utah State University (USU). The model simulations show little advantage in using phasic temperature control alone to increase average seed yield rate over the USU experimental values. However, simulations that combine phasic control of temperature (two phases) and photoperiod (two phases) do indicate the potential to improve seed yield (in g m-2 day-1) by approximately 15% over those currently obtained experimentally at USU for soybean cultivar Hoyt. This temperature and photoperiod phasing is experimentally practical. The simulations suggest extending photoperiods over those typically used experimentally during later phases of the crop life cycle, which would lengthen grain fill duration and thereby increase mass per seed. The model simulations indicate that the timing, and duration of extended photoperiods would be very important due to possible reductions in seed number m-2. Besides affecting seed yield directly, the model simulations suggest that such reductions may also cause feedback inhibition of photosynthesis due to low seed sink strength at elevated CO2 levels.
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The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 6
Claim · model-written summary
Temperature phasing alone showed little advantage for average seed yield rate over experimental values.
- Taxon
- soybean
Glycine maxt0 - Treatment
- phasic temperature control alonee0
- Outcome
- average seed yield ratee0
- Direction
- little advantagee0
- Comparator
- USU experimental valuese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The model simulations show little advantage in using phasic temperature control alone to increase average seed yield rate over the USU experimental values.”
t0“soybean”
Claim · model-written summary
Combined temperature and photoperiod phasing could improve seed yield by approximately 15% over USU values for Hoyt.
- Taxon
- soybeanGlycine maxe0
- Material
- Hoyte0
- Treatment
- phasic control of temperature (two phases) and photoperiod (two phases)e0
- Outcome
- seed yielde0
- Direction
- improvee0
- Value
- approximately 15%e0
- Comparator
- those currently obtained experimentally at USUe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“simulations that combine phasic control of temperature (two phases) and photoperiod (two phases) do indicate the potential to improve seed yield (in g m-2 day-1) by approximately 15% over those currently obtained experimentally at USU for soybean cultivar Hoyt.”
Claim · model-written summary
Longer later photoperiods were predicted to lengthen grain filling.
- Taxon
- soybeanGlycine maxt0
- Treatment
- extending photoperiodse0
- Outcome
- grain fill duratione0
- Direction
- lengthene0
- Comparator
- those typically used experimentallye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“extending photoperiods over those typically used experimentally during later phases of the crop life cycle, which would lengthen grain fill duration”
t0“soybean”
Claim · model-written summary
Longer later photoperiods were predicted to increase mass per seed.
- Taxon
- soybeanGlycine maxt0
- Outcome
- mass per seede0
- Direction
- increasee0
- Qualifier
- lengthen grain fill duratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which would lengthen grain fill duration and thereby increase mass per seed.”
t0“soybean”
Claim · model-written summary
Extended photoperiod timing and duration could reduce seed number per square metre.
- Taxon
- soybeanGlycine maxt0
- Treatment
- extended photoperiodse0
- Outcome
- seed number m-2e0
- Direction
- reductionse0
- Qualifier
- possiblee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the timing, and duration of extended photoperiods would be very important due to possible reductions in seed number m-2.”
t0“soybean”
Claim · model-written summary
Reduced seed sink strength at elevated CO2 may feed back to inhibit photosynthesis.
- Taxon
- soybeanGlycine maxt0
- Outcome
- photosynthesise0
- Qualifier
- low seed sink strength at elevated CO2 levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“such reductions may also cause feedback inhibition of photosynthesis due to low seed sink strength at elevated CO2 levels.”
t0“soybean”