Abstract
A 3-year study was conducted to measure the effect of sowing time and seeding rate on the development and yield of wheat (Triticum aestivum L.) grown under high-yielding conditions in north-eastern Victoria. A range of wheat cultivars with different development responses, including 'winter' types, was used in 2 experiments in each season. High grain yields for dryland wheat were measured in the first 2 seasons (1985-86), and in 1985, near-optimal water use efficiencies (>18 kg/ha. mm effective rainfall) were obtained. In the third season (1987) grain yield was limited by adverse climatic conditions-in the me- and post-anthesis period. In each season, grain yield declined with delay in sowing time. In 1985 there was a loss of 200-250 kg grain/ha for each week's delay in sowing time. In 1987, yield loss with delayed sowing was 50-110 kg grain/ha. In each season, cultivars with late or midseason maturity development gave the highest mean yields, and the use of these maturity types allowed earlier sowing, in mid April. However, with late sowing of wheat there was a trend for early maturity types to give higher yields, and so the use of 2 wheat cultivars with distinct maturity development responses to climate is recommended. If only 1 wheat cultivar is to be used, then a late maturity type is recommended. Higher wheat yields were also obtained as spike density increased, as a result of higher seeding rates. Our data suggest that in the higher rainfall region of north-eastern Victoria, a spike density of about 500 spikes/m2 is required to optimise wheat yields.
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Claims 8
Claim · model-written summary
Grain yield declined as sowing was delayed.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- delay in sowing timee0
- Outcome
- grain yielde0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat development and yield”
e0“In each season, grain yield declined with delay in sowing time”
Claim · model-written summary
In 1985, each week of delay in sowing lost 200-250 kg grain/ha of wheat yield.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- delay in sowing timee1
- Outcome
- grain yielde0
- Direction
- losse1
- Value
- 200-250 kg grain/hae1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat development and yield”
e0“In each season, grain yield declined with delay in sowing time”
e1“In 1985 there was a loss of 200-250 kg grain/ha for each week's delay in sowing time”
Claim · model-written summary
In 1987, delayed sowing lost 50-110 kg grain/ha of wheat yield.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- delayed sowinge2
- Outcome
- yielde2
- Direction
- yield losse2
- Value
- 50-110 kg grain/hae2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat development and yield”
e2“In 1987, yield loss with delayed sowing was 50-110 kg grain/ha”
Claim · model-written summary
With late sowing, early maturity wheat types tended to give higher yields.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- late sowinge3
- Outcome
- yieldse3
- Direction
- highere3
- Qualifier
- there was a trende3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat development and yield”
e3“with late sowing of wheat there was a trend for early maturity types to give higher yields”
Claim · model-written summary
Cultivars with late or midseason maturity gave the highest mean yields in each season.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- cultivars with late or midseason maturity developmente4
- Outcome
- mean yieldse4
- Direction
- higheste4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat development and yield”
e4“In each season, cultivars with late or midseason maturity development gave the highest mean yields”
Claim · model-written summary
A spike density of about 500 spikes/m2 is required to optimise wheat yields in the higher-rainfall region of north-eastern Victoria.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- spike densitye5
- Value
- about 500 spikes/m2e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat development and yield”
e5“a spike density of about 500 spikes/m2 is required to optimise wheat yields”
Claim · model-written summary
Two wheat cultivars with distinct maturity responses to climate should be used.
- Taxon
- wheatTriticum aestivume6
- Outcome
- the use of 2 wheat cultivarse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat development and yield”
e6“the use of 2 wheat cultivars with distinct maturity development responses to climate is recommended”
Claim · model-written summary
Higher wheat yields were obtained as spike density increased, as a result of higher seeding rates.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- higher seeding ratese7
- Outcome
- wheat yieldse7
- Direction
- Highere7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat development and yield”
e7“Higher wheat yields were also obtained as spike density increased, as a result of higher seeding rates”
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stage · yield · Triticum aestivum (wheat)Positive and negative results
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See all 462 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.