Abstract
Sweet sorghum [ Sorghum bicolor (L.) Moench] is a potential bioenergy crop that is capable of high biomass and sugar yields, but production for biofuel in the Southeast is not well understood. The present study examined the effects of planting date (three dates from mid‐March to mid‐June) on primary and ratoon crop fresh biomass, brix, and estimated sugar yield of three sweet sorghum cultivars (‘Dale’, ‘Topper 76‐6’, and ‘M‐81E’) grown at three sites from North (29°24′ N) to South Florida (26°40′ N). Across all treatments, primary crop fresh biomass, brix and estimated sugar yields were 70 Mg ha −1 , 148 g kg −1 , and 5.69 Mg ha −1 , respectively. Primary crop yields were greatest for the two earliest planting dates (mid‐March to mid‐May), and for our southernmost site. The yield potential for ratoon crops was in general only about half as much as the primary crop across all years, sites, and cultivars for the earliest planting date. An exception, however, was ratoon crop yields at the southernmost site, which were in some cases equal to or greater than primary crop yields. Low primary crop brix values were found for all cultivars on the muck soils in South Florida compared to the other two sites, and for M‐81E compared to Dale and Topper 76‐6. These low brix values were correlated with greater fresh biomass production. Further research is needed on planting dates for optimizing primary and ratoon crop yields along with varietal development with improved ratoon crop yields.
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Claims 11
Claim · model-written summary
Primary crop fresh biomass averaged 70 Mg ha −1 across treatments.
Verbatim
e0“Across all treatments, primary crop fresh biomass, brix and estimated sugar yields were 70 Mg ha −1 , 148 g kg −1 , and 5.69 Mg ha −1 , respectively.”
Claim · model-written summary
Primary crop brix averaged 148 g kg −1 across treatments.
Verbatim
t0“Sweet Sorghum”
e0“Across all treatments, primary crop fresh biomass, brix and estimated sugar yields were 70 Mg ha −1 , 148 g kg −1 , and 5.69 Mg ha −1 , respectively.”
Claim · model-written summary
Estimated primary crop sugar yield averaged 5.69 Mg ha −1.
Verbatim
t0“Sweet Sorghum”
e0“Across all treatments, primary crop fresh biomass, brix and estimated sugar yields were 70 Mg ha −1 , 148 g kg −1 , and 5.69 Mg ha −1 , respectively.”
Claim · model-written summary
Primary crop yield was greatest at the two earliest planting dates.
- Taxon
- Sweet Sorghumt0
- Treatment
- two earliest planting datese0
- Outcome
- Primary crop yieldse0
- Direction
- greateste0
- Qualifier
- mid‐March to mid‐Maye0
Not reportedComparator
Verbatim
t0“Sweet Sorghum”
e0“Primary crop yields were greatest for the two earliest planting dates (mid‐March to mid‐May), and for our southernmost site.”
Claim · model-written summary
Primary crop yield was greatest at the southernmost site.
Verbatim
t0“Sweet Sorghum”
e0“Primary crop yields were greatest for the two earliest planting dates (mid‐March to mid‐May), and for our southernmost site.”
Claim · model-written summary
Ratoon yield was generally about half primary crop yield at the earliest planting date.
Verbatim
t0“Sweet Sorghum”
e0“The yield potential for ratoon crops was in general only about half as much as the primary crop across all years, sites, and cultivars for the earliest planting date.”
Claim · model-written summary
At the southernmost site, ratoon yields sometimes equaled or exceeded primary yields.
Verbatim
t0“Sweet Sorghum”
e0“An exception, however, was ratoon crop yields at the southernmost site, which were in some cases equal to or greater than primary crop yields.”
Claim · model-written summary
All cultivars had lower brix on South Florida muck soils than at the other sites.
Verbatim
t0“Sweet Sorghum”
e0“Low primary crop brix values were found for all cultivars on the muck soils in South Florida compared to the other two sites, and for M‐81E compared to Dale and Topper 76‐6.”
Claim · model-written summary
M‐81E had lower brix than Dale and Topper 76‐6.
Verbatim
t0“Sweet Sorghum”
e0“Low primary crop brix values were found for all cultivars on the muck soils in South Florida compared to the other two sites, and for M‐81E compared to Dale and Topper 76‐6.”
Claim · model-written summary
Lower brix correlated with greater fresh biomass production.
Verbatim
t0“Sweet Sorghum”
e0“These low brix values were correlated with greater fresh biomass production.”
Claim · model-written summary
The authors call for more planting-date research and development of cultivars with better ratoon yield.
Verbatim
t0“Sweet Sorghum”
e0“Further research is needed on planting dates for optimizing primary and ratoon crop yields along with varietal development with improved ratoon crop yields.”
The same questions in other papers
sowing time · yield · SorghumPositive and negative results
49 papers in the same direction as this paper · 19 in the opposite direction · 2 reporting no difference from an alternative
- positive
- negative
- negative
67 papers more in this group
See all 71 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.