Abstract
Abstract A three factor central composite second order design in incomplete blocks was used to quantify the responses of semidwarf ‘Karamu’ wheat established at five seeding rates (170–580 seeds/m 2 ), and fertilised at five rates of N at the onset of tillering (0–124 kg/ha) and during spikelet growth (0–38 kg/ha). N applied at tillering raised grain yields by increasing spike populations and the mean number of spikelets per spike, but generally depressed mean grain dry weights and, at low rates, reduced grain content. Persistence of N in the soil after higher rates of application may have accounted for its linear responses in that it influenced more of the yield components. N fertiliser applied during spikelet growth tended to reduce spike populations, and its effects on other yield components depended on the level of N applied at early tillering. Thus it depressed spikelets per spike and mean grain weight when no N was applied at tillering and increased the values of these components when high rates were applied. Applications of N at tillering generally increased grain N content and grain N yield but had little influence on grain yield. Seeding rate increments modified components of yield but had little effect on grain yield or grain N content. Spike populations increased linearly with seeding rate but mean numbers of spikelets per spike declined especially at lower levels of N nutrition. At low seeding rates N appeared to be limiting grain set whereas at higher seeding rates assimilates appeared to be limiting. Thus the effects of seeding rate and N fertilisers at tillering were related to their common effect on spike populations.
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
Nitrogen at tillering raised grain yields through more spikes and spikelets per spike.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- N applied at tilleringe0
- Outcome
- grain yieldse0
- Direction
- raisede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N applied at tillering raised grain yields by increasing spike populations and the mean number of spikelets per spike”
t0“semidwarf wheat”
Claim · model-written summary
Nitrogen at tillering increased spike populations and mean spikelets per spike.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- N applied at tilleringe0
- Outcome
- spike populations and the mean number of spikelets per spikee0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N applied at tillering raised grain yields by increasing spike populations and the mean number of spikelets per spike”
t0“semidwarf wheat”
Claim · model-written summary
Nitrogen at tillering generally lowered mean grain dry weights.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- N applied at tilleringe0
- Outcome
- mean grain dry weightse0
- Direction
- depressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N applied at tillering raised grain yields by increasing spike populations and the mean number of spikelets per spike, but generally depressed mean grain dry weights”
t0“semidwarf wheat”
Claim · model-written summary
Low rates of nitrogen at tillering reduced grain content.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- low ratese0
- Outcome
- grain contente0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at low rates, reduced grain content”
t0“semidwarf wheat”
Claim · model-written summary
Nitrogen during spikelet growth tended to reduce spike populations.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- N fertiliser applied during spikelet growthe0
- Outcome
- spike populationse0
- Direction
- reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N fertiliser applied during spikelet growth tended to reduce spike populations”
t0“semidwarf wheat”
Claim · model-written summary
Nitrogen during spikelet growth depressed spikelets per spike and mean grain weight without nitrogen at tillering.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- ite0
- Outcome
- spikelets per spike and mean grain weighte0
- Direction
- depressede0
- Comparator
- no N was applied at tilleringe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it depressed spikelets per spike and mean grain weight when no N was applied at tillering”
t0“semidwarf wheat”
Claim · model-written summary
Nitrogen during spikelet growth increased these components when high nitrogen was applied at tillering.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- high ratese0
- Outcome
- the values of these componentse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased the values of these components when high rates were applied”
t0“semidwarf wheat”
Claim · model-written summary
Nitrogen at tillering generally increased grain nitrogen content and nitrogen yield.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- N at tilleringe0
- Outcome
- grain N content and grain N yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applications of N at tillering generally increased grain N content and grain N yield”
t0“semidwarf wheat”
Claim · model-written summary
Nitrogen at tillering had little influence on grain yield.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- N at tilleringe0
- Outcome
- grain yielde0
- Direction
- little influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applications of N at tillering generally increased grain N content and grain N yield but had little influence on grain yield”
t0“semidwarf wheat”
Claim · model-written summary
Seeding rate increments changed yield components.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Seeding rate incrementse0
- Outcome
- components of yielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seeding rate increments modified components of yield”
t0“semidwarf wheat”
Claim · model-written summary
Seeding rate had little effect on grain yield or grain nitrogen content.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Seeding rate incrementse0
- Outcome
- grain yield or grain N contente0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seeding rate increments modified components of yield but had little effect on grain yield or grain N content”
t0“semidwarf wheat”
Claim · model-written summary
Spike populations increased linearly with seeding rate.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- seeding ratee0
- Outcome
- Spike populationse0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spike populations increased linearly with seeding rate”
t0“semidwarf wheat”
Claim · model-written summary
Mean spikelets per spike declined with seeding rate, especially with lower nitrogen.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- lower levels of N nutritione0
- Outcome
- mean numbers of spikelets per spikee0
- Direction
- declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mean numbers of spikelets per spike declined especially at lower levels of N nutrition”
t0“semidwarf wheat”
Claim · model-written summary
Nitrogen appeared limiting for grain set at low seeding rates.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- low seeding ratese0
- Outcome
- grain sete0
- Qualifier
- N appeared to be limitinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At low seeding rates N appeared to be limiting grain set”
t0“semidwarf wheat”
Claim · model-written summary
Assimilates appeared limiting at higher seeding rates.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- higher seeding ratese0
- Outcome
- assimilates appeared to be limitinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at higher seeding rates assimilates appeared to be limiting”
t0“semidwarf wheat”
The same questions in other papers
tillage · pest · Triticum aestivum (wheat)Positive and negative results
27 papers in the same direction as this paper · 13 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- no effect
38 papers more in this group
See all 42 papers →fertilization · pest · Triticum aestivum (wheat)Positive and negative results
20 papers in the same direction as this paper · 63 in the opposite direction
- positive
- positive
- positive
80 papers more in this group
See all 84 papers →tillage · growth · Triticum aestivum (wheat)Positive and negative results
58 papers in the same direction as this paper · 208 in the opposite direction
- positive
- positive
- positive
263 papers more in this group
See all 267 papers →density · yield · Triticum aestivum (wheat)Positive and negative results
121 papers in the same direction as this paper · 376 in the opposite direction
- negative
- no effect
- positive
494 papers more in this group
See all 498 papers →tillage · yield · Triticum aestivum (wheat)Positive and negative results
1,115 papers in the same direction as this paper · 257 in the opposite direction · 41 reporting no difference from an alternative
- positive
- positive
- negative
1,410 papers more in this group
See all 1,414 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.