Abstract
Abstract Radiation‐use efficiency (RUE, g MJ− 1 ) has often been used in many crop model equations to estimate total biomass and yield based on cumulative absorbed photosynthetically active radiation. Management practice effects on radiation‐use efficiency have not been well documented for grain sorghum [ Sorghum bicolor (L.) Moench]. A field study was conducted near Temple, TX to determine plant density and cultivar effects on RUE in grain sorghum. Early ‘Cargill 4462’ and late maturing ‘Cargill 6670’ cultivars were planted on a Houston Black clay (fine, montmorillonitic, thermic Udic Paleustert) on 16 Mar. and 1 Aug. 1989 at 5, 12, 19, and 26 plants per square meter. Incoming, reflected, and transmitted photosynthetically active radiation were measured weekly from 6 wk after emergence until full anthesis. Dry matter and leaf area index were determined from 0.5‐m 2 areas immediately after the radiation measurements. The calculated extinction coefficient, 0.51, for PAR transmittance was significantly lower than in the crop growth model, SORKAM, documentation. This new value of extinction coefficient reduces total dry matter in and increases RUE in SORKAM. The average RUE for all treatments was 3.5 g MJ− 1 as compared with 3.2 g MJ− 1 in SORKAM. The new values will be incorporated into SORKAM. No significant radiation use efficiency differences were detected among density and maturity class treatments.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
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 5
Claim · model-written summary
The calculated PAR extinction coefficient was 0.51 and significantly lower than SORKAM documentation.
Verbatim
e0“The calculated extinction coefficient, 0.51, for PAR transmittance was significantly lower than in the crop growth model, SORKAM, documentation.”
Claim · model-written summary
The revised coefficient reduces modeled total dry matter in SORKAM.
Not reportedTaxon
Verbatim
e0“This new value of extinction coefficient reduces total dry matter in and increases RUE in SORKAM.”
Claim · model-written summary
The revised coefficient increases modeled RUE in SORKAM.
Not reportedTaxon
Verbatim
e0“This new value of extinction coefficient reduces total dry matter in and increases RUE in SORKAM.”
Claim · model-written summary
Average RUE was 3.5 g MJ− 1, versus 3.2 g MJ− 1 in SORKAM.
Not reportedTaxon
Verbatim
e0“The average RUE for all treatments was 3.5 g MJ− 1 as compared with 3.2 g MJ− 1 in SORKAM.”
Claim · model-written summary
Radiation use efficiency did not differ significantly among density and maturity class treatments.
- Treatment
- density and maturity class treatmentse0
- Outcome
- radiation use efficiencye0
- Direction
- No significante0
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant radiation use efficiency differences were detected among density and maturity class treatments.”
t0“Grain Sorghum”
The same questions in other papers
conjugated linoleic acid · growth · SorghumPositive and negative results
1 in the opposite direction
- positive
stage · growth · SorghumPositive and negative results
2 papers in the same direction as this paper · 6 in the opposite direction
- positive
- positive
- positive
5 papers more in this group
See all 9 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.