Abstract
Field studies were conducted on durum wheat to assess the effects of three sowing dates and three cultivars with different flowering times on the stability of the biomass accumulated per unit of solar radiation intercepted that is usually considered constant in crop-simulation models. Aboveground dry matter varied widely, with minimum values ranging from 292 g m–2 at booting to 384 g m–2 at maturity and maximum values ranging from 1452 g m–2 at booting to 2565 g m–2 at maturity. The cumulative intercepted radiation at each phenological stage decreased as sowing was delayed. The leaf area index (LAI) ranged from 1.5 to 7.6 at booting and from 0.1 to 4.6 at the beginning of grain filling across treatments. Sowing dates and cultivars did not differ significantly in extinction coefficient values (0.38 ± 0.015). The estimated radiation use efficiency (eRUE) differed significantly between the two seasons (1.16 ± 0.09 g MJ–1 in 2000 and 1.61 ± 0.08 g MJ–1 in 2001) due to waterlogging in 2000 but did not differ among sowing dates and cultivars within each season. Under optimal growing conditions, eRUE of different cultivars of durum wheat were relatively stable across sowing dates, confirming their reliability for crop modelling in durum wheat as well as in bread wheat. Although eRUE was constant over the whole crop cycle regardless of the sowing date, it was lower at pre-anthesis in the latest sowing, in parallel with the variation in LAI. This study indicates that pre-anthesis eRUE may vary with sowing date under some conditions, depending on the variation in LAI in the period before anthesis.
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Claims 8
Claim · model-written summary
Aboveground dry matter varied widely from booting to maturity.
- Taxon
- durum wheat
Triticum turgidum subsp. durumt0 - Outcome
- Aboveground dry mattere0
- Value
- 292 g m–2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Aboveground dry matter varied widely, with minimum values ranging from 292 g m–2 at booting to 384 g m–2 at maturity and maximum values ranging from 1452 g m–2 at booting to 2565 g m–2 at maturity.”
t0“durum wheat”
Claim · model-written summary
Intercepted radiation decreased with later sowing.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Treatment
- sowing was delayede0
- Outcome
- cumulative intercepted radiatione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The cumulative intercepted radiation at each phenological stage decreased as sowing was delayed.”
t0“durum wheat”
Claim · model-written summary
Leaf area index ranged from 1.5 to 7.6 at booting.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Organ / stage
- bootinge0
- Outcome
- leaf area index (LAI)e0
- Value
- 1.5 to 7.6e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The leaf area index (LAI) ranged from 1.5 to 7.6 at booting and from 0.1 to 4.6 at the beginning of grain filling across treatments.”
t0“durum wheat”
Claim · model-written summary
Leaf area index ranged from 0.1 to 4.6 at grain filling.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Organ / stage
- beginning of grain fillinge0
- Outcome
- leaf area index (LAI)e0
- Value
- 0.1 to 4.6e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The leaf area index (LAI) ranged from 1.5 to 7.6 at booting and from 0.1 to 4.6 at the beginning of grain filling across treatments.”
t0“durum wheat”
Claim · model-written summary
Extinction coefficient did not differ significantly among sowing dates and cultivars.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Treatment
- Sowing dates and cultivarse0
- Outcome
- extinction coefficient valuese0
- Direction
- did not differe0
- Value
- 0.38 ± 0.015e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sowing dates and cultivars did not differ significantly in extinction coefficient values (0.38 ± 0.015).”
t0“durum wheat”
Claim · model-written summary
Estimated radiation use efficiency was significantly higher in 2001 than 2000.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Outcome
- estimated radiation use efficiency (eRUE)e0
- Direction
- differede0
- Value
- 1.61 ± 0.08 g MJ–1e0
- Qualifier
- 1.16 ± 0.09 g MJ–1e0
- Comparator
- 2000e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The estimated radiation use efficiency (eRUE) differed significantly between the two seasons (1.16 ± 0.09 g MJ–1 in 2000 and 1.61 ± 0.08 g MJ–1 in 2001) due to waterlogging in 2000”
t0“durum wheat”
Claim · model-written summary
Estimated radiation use efficiency did not differ among sowing dates and cultivars within a season.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Treatment
- sowing dates and cultivarse0
- Outcome
- radiation use efficiencyt0
- Direction
- did not differe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but did not differ among sowing dates and cultivars within each season.”
t0“radiation use efficiency in durum wheat”
Claim · model-written summary
Pre-anthesis radiation use efficiency was lower at the latest sowing.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Organ / stage
- pre-anthesise0
- Treatment
- latest sowinge0
- Outcome
- radiation use efficiencyt0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it was lower at pre-anthesis in the latest sowing, in parallel with the variation in LAI.”
t0“radiation use efficiency in durum wheat”
The same questions in other papers
sowing time · growth · Triticum turgidum (rivet wheat)Positive and negative results
1 paper in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 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.