Abstract
ABSTRACT Maximum reported grain yields for hard red winter wheat ( Triticum aestivum L.) in the southern Great Plains range from 6 to 8 Mg ha –1 and are significantly lower than yields achieved in other regions of the world. The lack of empirical data for wheat under nonlimiting conditions in this region, however, suggests that maximum reported grain yields for the region might not represent maximum attainable yields. Our objective was to perform the agronomic characterization of wheat grown under nonlimiting conditions across the southern Great Plains. Four dryland and two irrigated fields were sown to ‘Iba’ winter wheat in the 2012–2013 growing season and repeated during 2013–2014 in central Oklahoma. Fields were intensively managed for fertility for maximum yield and freedom from weeds, insects, and disease. Aboveground dry matter at maturity ranged from 9.95 to 20.5 Mg ha –1 , but harvest index (HI) did not surpass 0.41 and grain yields ranged from 3.06 to 7.68 Mg ha –1 . The highest yield was achieved under irrigated conditions in 2013–2014, but one dryland site produced 7.11 Mg ha –1 grain in 2012–2013. Maximum radiation‐use efficiency (RUE) ranged from 0.8 to 1.9 g MJ –1 and water‐use efficiency (WUE) from 7.8 to 12.6 kg ha –1 mm –1 . The wheat characteristics measured in this study were near or above maximum values reported in the literature for the region, and our data provide empirical evidence to support maximum attainable wheat yields of 7.68 Mg ha –1 when wheat is grown under nonlimiting conditions in the southern Great Plains.
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Claims 9
Claim · model-written summary
Wheat aboveground dry matter at maturity ranged from 9.95 to 20.5 Mg ha –1.
- Taxon
- wheat
Triticum aestivumt0 - Outcome
- Aboveground dry matter at maturitye0
- Value
- 9.95 to 20.5 Mg ha –1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Aboveground dry matter at maturity ranged from 9.95 to 20.5 Mg ha –1”
t0“Wheat Yield”
Claim · model-written summary
Harvest index did not surpass 0.41.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- harvest index (HI)e0
- Direction
- did not surpasse0
- Value
- 0.41e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“harvest index (HI) did not surpass 0.41”
t0“Wheat Yield”
Claim · model-written summary
Wheat grain yields ranged from 3.06 to 7.68 Mg ha –1.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- grain yieldse0
- Value
- 3.06 to 7.68 Mg ha –1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain yields ranged from 3.06 to 7.68 Mg ha –1”
t0“Wheat Yield”
Claim · model-written summary
Highest yield was under irrigation in 2013–2014.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- irrigated conditionse0
- Outcome
- yielde0
- Direction
- higheste0
- Qualifier
- 2013–2014e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest yield was achieved under irrigated conditions in 2013–2014”
t0“Wheat Yield”
Claim · model-written summary
One dryland site yielded 7.11 Mg ha –1 grain in 2012–2013.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- graine0
- Value
- 7.11 Mg ha –1e0
- Qualifier
- 2012–2013e0
- Setting
- dryland sitee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“one dryland site produced 7.11 Mg ha –1 grain in 2012–2013”
t0“Wheat Yield”
Claim · model-written summary
Maximum radiation-use efficiency ranged from 0.8 to 1.9 g MJ –1.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- radiation‐use efficiency (RUE)e0
- Direction
- Maximume0
- Value
- 0.8 to 1.9 g MJ –1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum radiation‐use efficiency (RUE) ranged from 0.8 to 1.9 g MJ –1”
t0“Wheat Yield”
Claim · model-written summary
Water-use efficiency ranged from 7.8 to 12.6 kg ha –1 mm –1.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- water‐use efficiency (WUE)e0
- Value
- 7.8 to 12.6 kg ha –1 mm –1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water‐use efficiency (WUE) from 7.8 to 12.6 kg ha –1 mm –1”
t0“Wheat Yield”
Claim · model-written summary
Measured wheat characteristics were near or above regional reported maxima.
- Taxon
- wheatTriticum aestivume0
- Outcome
- wheat characteristicse0
- Direction
- near or abovee0
- Comparator
- maximum values reported in the literature for the regione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The wheat characteristics measured in this study were near or above maximum values reported in the literature for the region”
Claim · model-written summary
The authors support 7.68 Mg ha –1 as attainable under nonlimiting conditions.
- Taxon
- wheatTriticum aestivume0
- Outcome
- maximum attainable wheat yieldse0
- Value
- 7.68 Mg ha –1e0
- Qualifier
- nonlimiting conditionse0
- Setting
- southern Great Plainse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maximum attainable wheat yields of 7.68 Mg ha –1 when wheat is grown under nonlimiting conditions in the southern Great Plains”