Abstract
Eleven field trials were sown in the northeastern wheatbelt of Western Australia to test the hypothesis that if wheat cultivars with suitable maturity are sown earlier than current practice, then higher grain yields will be achieved. The experiments included time of sowing treatments that ranged from early May to late June in 1988, 1989 and 1990. Seven commercial cultivars with a wide range of developmental patterns and maturities were used. Sowing between mid May and early June produced the highest grain yields. For plantings after early June, yields declined by approximately 250 kg/ha (15%) per week. Delayed sowing caused a decrease in dry matter and kernel number (per m2). In general this reduction in kernel number was not compensated by an improvement in kernel weight. At early times of sowing, the medium-long season cultivars generally had higher yields than short season cultivars. The short season cultivars were the highest yielding cultivars at the late times of sowing. These results suggest that cultivars should be chosen to suit the seasonal break, which may vary from late April to mid June. As a consequence, farmers should be encouraged to retain a number of cultivars with differing maturities suited to a range of planting times.
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Claims 8
Claim · model-written summary
Mid-May to early-June sowing produced the highest grain yield.
- Taxon
- spring wheat
Triticum aestivumt0 - Treatment
- Sowing between mid May and early Junee0
- Outcome
- grain yieldse0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“spring wheat”
e0“Sowing between mid May and early June produced the highest grain yields.”
Claim · model-written summary
After early June, yield fell about 250 kg/ha or 15% each week.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- plantings after early Junee0
- Outcome
- yieldse0
- Direction
- declinede0
- Value
- 250 kg/hae0
- Qualifier
- (15%) per weeke0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“spring wheat”
e0“For plantings after early June, yields declined by approximately 250 kg/ha (15%) per week.”
Claim · model-written summary
Delayed sowing decreased dry matter.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- Delayed sowinge0
- Outcome
- dry mattere0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“spring wheat”
e0“Delayed sowing caused a decrease in dry matter and kernel number (per m2).”
Claim · model-written summary
Delayed sowing decreased kernel number (per m2).
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- Delayed sowinge0
- Outcome
- kernel number (per m2)e0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“spring wheat”
e0“Delayed sowing caused a decrease in dry matter and kernel number (per m2).”
Claim · model-written summary
Kernel weight generally did not compensate for reduced kernel number.
- Taxon
- spring wheatTriticum aestivumt0
- Outcome
- kernel weighte0
- Direction
- not compensatede0
- Qualifier
- this reduction in kernel numbere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“spring wheat”
e0“In general this reduction in kernel number was not compensated by an improvement in kernel weight.”
Claim · model-written summary
At early sowing, medium-long season cultivars generally yielded more than short season cultivars.
- Taxon
- spring wheatTriticum aestivumt0
- Material
- medium-long season cultivarse0
- Outcome
- yieldse0
- Direction
- highere0
- Comparator
- short season cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“spring wheat”
e0“At early times of sowing, the medium-long season cultivars generally had higher yields than short season cultivars.”
Claim · model-written summary
At late sowing, short season cultivars had the highest yields.
- Taxon
- spring wheatTriticum aestivumt0
- Material
- short season cultivarse0
- Outcome
- highest yielding cultivarse0
- Direction
- higheste0
- Qualifier
- late times of sowinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“spring wheat”
e0“The short season cultivars were the highest yielding cultivars at the late times of sowing.”
Claim · model-written summary
Farmers should retain cultivars with different maturities suited to planting times.
- Taxon
- spring wheatTriticum aestivumt0
- Outcome
- retain a number of cultivars with differing maturities suited to a range of planting timese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“spring wheat”
e0“farmers should be encouraged to retain a number of cultivars with differing maturities suited to a range of planting times.”
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