Abstract
Growth chamber studies were conducted to determine if inverse day/night temperature could control canopy height of sweetpotato without adversely affecting storage root yield. Four 15-cm-long vine cuttings of TU-82-155 sweetpotato were grown in rectangular nutrient film technique hydroponic troughs for 120 days. Two troughs were placed into each of six reach-in growth chambers and subjected to 24/18, 26/20, 28/22, 18/24, 20/26, and 22/28 °C, respectively. Growth chamber conditions included a 12/12-h photoperiod, 70% RH, and photosynthetic photon flux of 1000 μmol·m -2 ·s -1 at canopy level. Total and edible storage root yields were reduced by 50% among plants grown under cool days/warm nights regimes. Harvest index was similar among treatments except for the low value obtained at 22/28 °C. Canopy height was positively correlated with the change in temperature, and for every 2 °C decrease there was a 3.1 centimeter decrease in canopy height. Inverse day/night temperature effectively controlled canopy height but at the expense of storage root production.
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Claims 6
Claim · model-written summary
Cool days and warm nights reduced total storage-root yield by 50%.
Not reportedTaxonComparator
Verbatim
e0“Total and edible storage root yields were reduced by 50% among plants grown under cool days/warm nights regimes”
Claim · model-written summary
Cool days and warm nights reduced edible storage-root yield by 50%.
- Treatment
- cool days/warm nights regimese0
- Outcome
- edible storage root yieldse0
- Direction
- reducede0
- Value
- 50%e0
Not reportedTaxonComparator
Verbatim
e0“Total and edible storage root yields were reduced by 50% among plants grown under cool days/warm nights regimes”
Claim · model-written summary
Harvest index was similar across treatments except for a low value at 22/28 °C.
Not reportedTaxon
Verbatim
e0“Harvest index was similar among treatments except for the low value obtained at 22/28 °C”
Claim · model-written summary
Canopy height was positively correlated with temperature change.
Not reportedTaxon
Verbatim
e0“Canopy height was positively correlated with the change in temperature”
Claim · model-written summary
Each 2 °C decrease corresponded to a 3.1 cm decrease in canopy height.
Not reportedTaxon
Verbatim
e0“for every 2 °C decrease there was a 3.1 centimeter decrease in canopy height”
Claim · model-written summary
Inverse day-night temperature controlled canopy height at the expense of storage-root production.
Not reportedTaxon
Verbatim
e0“Inverse day/night temperature effectively controlled canopy height but at the expense of storage root production”