Abstract
The effect of fertilizer N on the growth, post-anthesis water deficits and remobilization of dry matter in spring wheat was measured on a duplex soil at East Beverley, Western Australia. Nitrogen was applied at 15, 30 and 60 kg N ha-1 with half being applied at seeding and the remainder at 35 days after sowing (DAS), immediately before the onset of tillering. The applied N generated differences in early growth (76-117 g m-2) and dry matter at anthesis (410-693 g m-2), mainly through the effect of N on tiller number (120-171 m-2) and tiller size. It also generated differences in the water deficit, particularly after flowering. During the first 21 days after anthesis, midday flag leaf water potential fell at rates of 0.04, 0.07 and 0.13 MPa day-1 at 15, 30 and 60 kg N ha-1 respectively. Grain yield at 60 kg N ha-1 was increased by 20% relative to that of 15 kg N ha-1. The increase in grain yield resulted from an increase in the number of ears and grain number per ear. The high N treatment probably induced the increase in the number of fertile tillers (tillers with an ear), but reduced the grain size by 16% relative to the low N treatment. Contribution of preanthesis dry matter to grain yield was 193 g m-2 for the wheat receiving 60 kg N ha-1, 71 g m-2 for wheat which received 30 kg N ha-1 and only 16 g m-2 for wheat which received 15 kg N ha-1. This indicates that at high N supply, grain growth was substantially supported by pre-anthesis stored assimilates.
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 15
Claim · model-written summary
Applied N generated differences in early wheat growth.
- Taxon
- spring wheat
Triticum aestivume1 - Treatment
- applied Ne0
- Outcome
- early growthe0
- Direction
- differencese0
- Value
- 76-117 g m-2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The applied N generated differences in early growth (76-117 g m-2)”
e1“spring wheat”
Claim · model-written summary
Applied N generated differences in dry matter at anthesis.
- Taxon
- spring wheatTriticum aestivume2
- Treatment
- applied Ne1
- Outcome
- dry matter at anthesise0
- Direction
- differencese1
- Value
- 410-693 g m-2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dry matter at anthesis (410-693 g m-2)”
e1“The applied N generated differences in early growth (76-117 g m-2) and dry matter at anthesis (410-693 g m-2)”
e2“spring wheat”
Claim · model-written summary
Nitrogen affected tiller number and tiller size.
- Taxon
- spring wheatTriticum aestivume1
- Treatment
- Ne0
- Outcome
- tiller numbere0
- Value
- 120-171 m-2e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“effect of N on tiller number (120-171 m-2) and tiller size”
e1“spring wheat”
Claim · model-written summary
N generated differences in water deficit, especially after flowering.
- Taxon
- spring wheatTriticum aestivume2
- Treatment
- fertilizer Ne1
- Outcome
- water deficite0
- Direction
- differencese0
- Qualifier
- particularly after floweringe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It also generated differences in the water deficit, particularly after flowering”
e1“fertilizer N”
e2“spring wheat”
Claim · model-written summary
Flag leaf water potential fell at 0.04 MPa per day at 15 kg N per hectare.
- Taxon
- spring wheatTriticum aestivume1
- Treatment
- 15e0
- Outcome
- midday flag leaf water potentiale0
- Direction
- felle0
- Value
- 0.04e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“midday flag leaf water potential fell at rates of 0.04, 0.07 and 0.13 MPa day-1 at 15, 30 and 60 kg N ha-1 respectively”
e1“spring wheat”
Claim · model-written summary
Flag leaf water potential fell at 0.07 MPa per day at 30 kg N per hectare.
- Taxon
- spring wheatTriticum aestivume1
- Treatment
- 30e0
- Outcome
- midday flag leaf water potentiale0
- Direction
- felle0
- Value
- 0.07e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“midday flag leaf water potential fell at rates of 0.04, 0.07 and 0.13 MPa day-1 at 15, 30 and 60 kg N ha-1 respectively”
e1“spring wheat”
Claim · model-written summary
Flag leaf water potential fell at 0.13 MPa per day at 60 kg N per hectare.
- Taxon
- spring wheatTriticum aestivume1
- Treatment
- 60 kg N ha-1e0
- Outcome
- midday flag leaf water potentiale0
- Direction
- felle0
- Value
- 0.13e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“midday flag leaf water potential fell at rates of 0.04, 0.07 and 0.13 MPa day-1 at 15, 30 and 60 kg N ha-1 respectively”
e1“spring wheat”
Claim · model-written summary
Grain yield was 20% higher at 60 than 15 kg N per hectare.
- Taxon
- spring wheatTriticum aestivume1
- Treatment
- 60 kg N ha-1e0
- Outcome
- Grain yielde0
- Direction
- increasede0
- Value
- 20%e0
- Comparator
- 15 kg N ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield at 60 kg N ha-1 was increased by 20% relative to that of 15 kg N ha-1”
e1“spring wheat”
Claim · model-written summary
Higher grain yield was attributed to more ears and more grains per ear.
- Taxon
- spring wheatTriticum aestivume1
- Outcome
- increase in grain yielde0
- Qualifier
- increase in the number of ears and grain number per eare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increase in grain yield resulted from an increase in the number of ears and grain number per ear”
e1“spring wheat”
Claim · model-written summary
High N probably increased the number of fertile tillers.
- Taxon
- spring wheatTriticum aestivume1
- Treatment
- high N treatmente0
- Outcome
- number of fertile tillerse0
- Direction
- increasee0
- Qualifier
- probablye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The high N treatment probably induced the increase in the number of fertile tillers (tillers with an ear)”
e1“spring wheat”
Claim · model-written summary
High N reduced grain size by 16% relative to low N.
- Taxon
- spring wheatTriticum aestivume2
- Treatment
- high N treatmente1
- Outcome
- grain sizee0
- Direction
- reducede0
- Value
- 16%e0
- Comparator
- low N treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced the grain size by 16% relative to the low N treatment”
e1“The high N treatment probably induced”
e2“spring wheat”
Claim · model-written summary
Preanthesis dry matter contributed 193 g per square metre to grain yield at 60 kg N per hectare.
- Taxon
- wheatTriticum aestivume0
- Treatment
- 60 kg N ha-1e0
- Outcome
- Contribution of preanthesis dry matter to grain yielde0
- Value
- 193 g m-2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Contribution of preanthesis dry matter to grain yield was 193 g m-2 for the wheat receiving 60 kg N ha-1”
Claim · model-written summary
Preanthesis dry matter contributed 71 g per square metre to grain yield at 30 kg N per hectare.
- Taxon
- wheatTriticum aestivume0
- Treatment
- 30 kg N ha-1e0
- Outcome
- Contribution of preanthesis dry matter to grain yielde1
- Value
- 71 g m-2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“71 g m-2 for wheat which received 30 kg N ha-1”
e1“Contribution of preanthesis dry matter to grain yield was 193 g m-2 for the wheat receiving 60 kg N ha-1, 71 g m-2”
Claim · model-written summary
Preanthesis dry matter contributed 16 g per square metre to grain yield at 15 kg N per hectare.
- Taxon
- wheatTriticum aestivume0
- Treatment
- 15 kg N ha-1e0
- Outcome
- Contribution of preanthesis dry matter to grain yielde1
- Value
- 16 g m-2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only 16 g m-2 for wheat which received 15 kg N ha-1”
e1“Contribution of preanthesis dry matter to grain yield was 193 g m-2”
Claim · model-written summary
High N grain growth was substantially supported by preanthesis stored assimilates.
- Taxon
- spring wheatTriticum aestivume1
- Outcome
- grain growthe0
- Qualifier
- pre-anthesis stored assimilatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at high N supply, grain growth was substantially supported by pre-anthesis stored assimilates”
e1“spring wheat”
The same questions in other papers
nitrogen · yield · Triticum aestivum (wheat)Positive and negative results
1,736 papers in the same direction as this paper · 285 in the opposite direction · 39 reporting no difference from an alternative
- negative
- negative
- positive
2,057 papers more in this group
See all 2,061 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.