Abstract
Abstract The optimal N‐supply in spring for different plant densities of winter wheat The influence of plant density (plt./m 2 ) on the optimal N‐supply in spring (N min ‐content + N‐fertilization) has been tested at three sites. The different plant density was produced by different seed rates in autumn of about 150, 250, 350, 450 and 550 grains/m 2 . The N‐supply in spring was ‐ apart from a non‐fertilized field (N min ‐content) 80, 100, 120, 140 and 160 kg N/ha. Additionally, 80 kg N/ha were applicated as N‐topdressing. Moreover the optimal N‐supply in spring has been tested on a winter wheat field thinned out due to winterkilling. In detail we got the following results: 1. The reduction of the N min ‐content due to the N‐uptake by the plants slowed down in accordance with minor plant density. 2. The same N‐supply in the soil produced a higher N‐supply per individual plant in accordance with decreasing plant density and lead to a considerable increase of N‐nutrition. 3. Thin crops showed a higher tillering. The differences in plant density between 150 and 550 plt./m 2 in spring diminished to about 90 ears/m 2 at harvest. 4. Independently of plant density the maximum yield was obtained by a N‐supply (N min + N‐fertilization) in spring of about 120 kg/ha N. Due to the abundant N‐nutrition of the individual plants and the minor increase of yield a higher N‐supply is not necessary with a minor plant density. 5. Essentially the yield level was only diminished with the lowest plant density (100‐140 plt./m 2 ).
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Claims 8
Claim · model-written summary
The reduction of soil N min content by plant N uptake slowed down at lower plant density.
- Taxon
- winter wheat
Triticum aestivume0 - Outcome
- reductione1
- Direction
- slowed downe1
- Qualifier
- in accordance with minor plant densitye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The optimal N‐supply in spring for different plant densities of winter wheat”
e1“The reduction of the N min ‐content due to the N‐uptake by the plants slowed down in accordance with minor plant density”
Claim · model-written summary
The same soil N supply gave a higher N supply per individual winter wheat plant at decreasing plant density.
- Taxon
- winter wheatTriticum aestivume0
- Outcome
- N‐supply per individual plante2
- Direction
- highere2
- Qualifier
- in accordance with decreasing plant densitye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The optimal N‐supply in spring for different plant densities of winter wheat”
e2“The same N‐supply in the soil produced a higher N‐supply per individual plant in accordance with decreasing plant density”
Claim · model-written summary
Lower plant density led to a considerable increase of N-nutrition in winter wheat.
- Taxon
- winter wheatTriticum aestivume0
- Outcome
- N‐nutritione3
- Direction
- increasee3
- Qualifier
- considerablee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The optimal N‐supply in spring for different plant densities of winter wheat”
e3“lead to a considerable increase of N‐nutrition”
Claim · model-written summary
Thin winter wheat crops showed higher tillering.
- Taxon
- winter wheatTriticum aestivume0
- Treatment
- Thin cropse4
- Outcome
- tilleringe4
- Direction
- highere4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The optimal N‐supply in spring for different plant densities of winter wheat”
e4“Thin crops showed a higher tillering”
Claim · model-written summary
Differences in plant density between 150 and 550 plants per m2 diminished to about 90 ears per m2 at harvest.
- Taxon
- winter wheatTriticum aestivume0
- Outcome
- differences in plant densitye5
- Direction
- diminishede5
- Value
- about 90 ears/m 2e5
- Qualifier
- at harveste5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The optimal N‐supply in spring for different plant densities of winter wheat”
e5“The differences in plant density between 150 and 550 plt./m 2 in spring diminished to about 90 ears/m 2 at harvest”
Claim · model-written summary
Maximum winter wheat yield was obtained with about 120 kg/ha N supply in spring, independently of plant density.
- Taxon
- winter wheatTriticum aestivume0
- Treatment
- N min + N‐fertilizatione6
- Outcome
- yielde6
- Direction
- maximume6
- Value
- 120 kg/hae6
- Qualifier
- Independently of plant densitye6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The optimal N‐supply in spring for different plant densities of winter wheat”
e6“Independently of plant density the maximum yield was obtained by a N‐supply (N min + N‐fertilization) in spring of about 120 kg/ha N”
Claim · model-written summary
Yield level of winter wheat was reduced only at the lowest plant density of 100-140 plants per m2.
- Taxon
- winter wheatTriticum aestivume0
- Treatment
- lowest plant densitye1
- Outcome
- yield levele1
- Direction
- diminishede1
- Value
- 100‐140 plt./m 2e1
- Qualifier
- onlye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The optimal N‐supply in spring for different plant densities of winter wheat”
e1“Essentially the yield level was only diminished with the lowest plant density (100‐140 plt./m 2 )”
Claim · model-written summary
A higher N supply is not necessary at a minor plant density of winter wheat.
- Taxon
- winter wheatTriticum aestivume0
- Outcome
- higher N‐supply is not necessarye7
- Qualifier
- with a minor plant densitye7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The optimal N‐supply in spring for different plant densities of winter wheat”
e7“a higher N‐supply is not necessary with a minor plant density”
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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.