Abstract
A sweet sorghum (cv. Wray) and a forage sorghum (cv. Silk) were grown in south-east Queensland without water deficit at two densities in 0.75 m rows on four occasions between late September and mid January. Tiller and branch numbers, and dry matter production, were recorded at appearance of the third leaf ligule, panicle initiation, anthesis, soft-dough stage, maturity and 3 weeks after maturity. Light interception was measured every 2 weeks. The time between all the studied phenological events up to anthesis was shortened with delay in sowing date except for that between appearance of the third ligule and initiation in cv. Silk. The time between anthesis and maturity lengthened with the delay in sowing date of both cultivars. Rate of development was a function of ambient temperature to the third ligule stage and again during maturation. Tiller and branch production were greatest in cv. Silk, decreased with delay in sowing date for both sorghums and was increased by the high density. The estimated assimilate flux required to sustain basal tillers was substantially lower in cv. Silk than in cv. Wray. This flux increased with temperature. In early sown crops, dry matter yields of cv. Wray were greater than those of cv. Silk. Close spacing increased dry matter yields up to anthesis, but by maturity the effect of spacing had been reduced. Cv. Wray produced a larger leaf canopy more rapidly than cv. Silk, although the partitioning of dry matter to leaf tissue only differed between cultivars after canopy closure. The efficiency with which crops used intercepted light energy to produce new above-ground dry matter changed during their ontogeny. It is suggested that early changes in efficiency were a consequence of altered partitioning to roots. The effect of sowing date and spacing on efficiency of light use was slight until the maturation phase, when efficiency decreased with delay in sowing date and at high density. Water use efficiency differed in a similar way to light use efficiency. The relationships found in this study indicate that sorghum growth models need to recognise differences in the morphological development of sorghum types.
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Claims 17
Claim · model-written summary
In both sorghums the time between all studied phenological events up to anthesis was shortened with delay in sowing date, except between third ligule and panicle initiation in cv. Silk.
- Treatment
- delay in sowing datee1
- Outcome
- time between all the studied phenological events up to anthesise1
- Direction
- shortenede1
- Setting
- south-east Queenslande0
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A sweet sorghum (cv. Wray) and a forage sorghum (cv. Silk) were grown in south-east Queensland”
e1“The time between all the studied phenological events up to anthesis was shortened with delay in sowing date”
Claim · model-written summary
The time between anthesis and maturity lengthened with delay in sowing date in both cultivars.
- Treatment
- delay in sowing datee1
- Outcome
- time between anthesis and maturitye1
- Direction
- lengthenede1
- Setting
- south-east Queenslande0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A sweet sorghum (cv. Wray) and a forage sorghum (cv. Silk) were grown in south-east Queensland”
e1“The time between anthesis and maturity lengthened with the delay in sowing date of both cultivars”
Claim · model-written summary
Rate of development was a function of ambient temperature up to the third ligule stage and again during maturation.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A sweet sorghum (cv. Wray) and a forage sorghum (cv. Silk) were grown in south-east Queensland”
e1“Rate of development was a function of ambient temperature to the third ligule stage and again during maturation”
Claim · model-written summary
Tiller and branch production were greatest in cv. Silk.
- Material
- cv. Silke1
- Outcome
- Tiller and branch productione1
- Direction
- greateste1
- Setting
- south-east Queenslande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A sweet sorghum (cv. Wray) and a forage sorghum (cv. Silk) were grown in south-east Queensland”
e1“Tiller and branch production were greatest in cv. Silk, decreased with delay in sowing date for both sorghums and was increased by the high density”
Claim · model-written summary
Tiller and branch production decreased with delay in sowing date for both sorghums.
- Treatment
- delay in sowing datee1
- Outcome
- Tiller and branch productione1
- Direction
- decreasede1
- Setting
- south-east Queenslande0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A sweet sorghum (cv. Wray) and a forage sorghum (cv. Silk) were grown in south-east Queensland”
e1“Tiller and branch production were greatest in cv. Silk, decreased with delay in sowing date for both sorghums and was increased by the high density”
Claim · model-written summary
Tiller and branch production was increased by the high density.
- Treatment
- high densitye1
- Outcome
- Tiller and branch productione1
- Direction
- increasede1
- Setting
- south-east Queenslande0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A sweet sorghum (cv. Wray) and a forage sorghum (cv. Silk) were grown in south-east Queensland”
e1“Tiller and branch production were greatest in cv. Silk, decreased with delay in sowing date for both sorghums and was increased by the high density”
Claim · model-written summary
The estimated assimilate flux required to sustain basal tillers was substantially lower in cv. Silk than in cv. Wray.
- Material
- cv. Silke1
- Outcome
- estimated assimilate flux required to sustain basal tillerse1
- Direction
- lowere1
- Comparator
- cv. Wraye1
- Setting
- south-east Queenslande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A sweet sorghum (cv. Wray) and a forage sorghum (cv. Silk) were grown in south-east Queensland”
e1“The estimated assimilate flux required to sustain basal tillers was substantially lower in cv. Silk than in cv. Wray”
Claim · model-written summary
The assimilate flux required to sustain basal tillers increased with temperature.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A sweet sorghum (cv. Wray) and a forage sorghum (cv. Silk) were grown in south-east Queensland”
e1“This flux increased with temperature”
Claim · model-written summary
In early sown crops, dry matter yields of cv. Wray were greater than those of cv. Silk.
- Material
- cv. Wraye1
- Outcome
- dry matter yieldse1
- Direction
- greatere1
- Qualifier
- early sown cropse1
- Comparator
- cv. Silke1
- Setting
- south-east Queenslande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A sweet sorghum (cv. Wray) and a forage sorghum (cv. Silk) were grown in south-east Queensland”
e1“In early sown crops, dry matter yields of cv. Wray were greater than those of cv. Silk”
Claim · model-written summary
Close spacing increased dry matter yields up to anthesis, but by maturity the effect of spacing had been reduced.
- Treatment
- Close spacinge1
- Outcome
- dry matter yieldse1
- Direction
- increasede1
- Qualifier
- up to anthesise1
- Setting
- south-east Queenslande0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A sweet sorghum (cv. Wray) and a forage sorghum (cv. Silk) were grown in south-east Queensland”
e1“Close spacing increased dry matter yields up to anthesis, but by maturity the effect of spacing had been reduced”
Claim · model-written summary
Cv. Wray produced a larger leaf canopy more rapidly than cv. Silk.
- Material
- Cv. Wraye1
- Outcome
- leaf canopye1
- Direction
- largere1
- Comparator
- cv. Silke1
- Setting
- south-east Queenslande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A sweet sorghum (cv. Wray) and a forage sorghum (cv. Silk) were grown in south-east Queensland”
e1“Cv. Wray produced a larger leaf canopy more rapidly than cv. Silk”
Claim · model-written summary
Partitioning of dry matter to leaf tissue differed between cultivars only after canopy closure.
- Outcome
- partitioning of dry matter to leaf tissuee1
- Qualifier
- after canopy closuree1
- Setting
- south-east Queenslande0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A sweet sorghum (cv. Wray) and a forage sorghum (cv. Silk) were grown in south-east Queensland”
e1“the partitioning of dry matter to leaf tissue only differed between cultivars after canopy closure”
Claim · model-written summary
The efficiency with which crops used intercepted light energy to produce new above-ground dry matter changed during their ontogeny.
- Outcome
- efficiency with which crops used intercepted light energy to produce new above-ground dry mattere1
- Qualifier
- during their ontogenye1
- Setting
- south-east Queenslande0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A sweet sorghum (cv. Wray) and a forage sorghum (cv. Silk) were grown in south-east Queensland”
e1“The efficiency with which crops used intercepted light energy to produce new above-ground dry matter changed during their ontogeny”
Claim · model-written summary
The authors suggest that early changes in light-use efficiency were a consequence of altered partitioning to roots.
- Outcome
- early changes in efficiencye1
- Qualifier
- altered partitioning to rootse1
- Setting
- south-east Queenslande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A sweet sorghum (cv. Wray) and a forage sorghum (cv. Silk) were grown in south-east Queensland”
e1“It is suggested that early changes in efficiency were a consequence of altered partitioning to roots”
Claim · model-written summary
The effect of sowing date and spacing on light-use efficiency was slight until the maturation phase, when efficiency decreased with delay in sowing date and at high density.
- Treatment
- delay in sowing date and at high densitye1
- Outcome
- efficiency of light usee1
- Direction
- decreasede1
- Qualifier
- the maturation phasee1
- Setting
- south-east Queenslande0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A sweet sorghum (cv. Wray) and a forage sorghum (cv. Silk) were grown in south-east Queensland”
e1“The effect of sowing date and spacing on efficiency of light use was slight until the maturation phase, when efficiency decreased with delay in sowing date and at high density”
Claim · model-written summary
Water use efficiency differed with sowing date and density in a similar way to light use efficiency.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A sweet sorghum (cv. Wray) and a forage sorghum (cv. Silk) were grown in south-east Queensland”
e1“Water use efficiency differed in a similar way to light use efficiency”
Claim · model-written summary
The authors conclude that sorghum growth models need to recognise differences in the morphological development of sorghum types.
- Outcome
- recognise differences in the morphological development of sorghum typese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“sorghum growth models need to recognise differences in the morphological development of sorghum types”
The same questions in other papers
density · yield · SorghumPositive and negative results
82 papers in the same direction as this paper · 14 in the opposite direction · 1 reporting no difference from an alternative
- negative
- positive
- no effect
94 papers more in this group
See all 98 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.