Claim · model-written summary
At the site with little water deficit, high nitrogen increased dry grain yield from 607 to 798 g/m2.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- high-N crope0
- Outcome
- dry grain yielde0
- Direction
- increasede0
- Value
- 798 g/m2e0
- Qualifier
- 607 g/m2e0
- Comparator
- low-N control crope0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At a site where the crops encountered little water deficit, dry grain yield increased from 607 g/m2 for a low-N control crop to 798 g/m2 for a high-N crop.”
t0“wheat”
Title
A. F. van Herwaarden; G. D. Farquhar; J. F. Angus; et al. Australian Journal of Agricultural Research 1998. doi:10.1071/a97039
Other claims from this paper (19)
- Intervention effect Under severe terminal drought, highest nitrogen decreased grain yield 24% from 374 to 284 g/m2.
- Intervention effect At the third site, small nitrogen applications increased yield.
- Intervention effect At the third site, greater nitrogen applications reduced yield.
- Intervention effect Nitrogen increased biomass at anthesis at all sites.
- Intervention effect Nitrogen increased spike density, kernels per spike, and kernel number at all sites.
- Intervention effect Additional nitrogen decreased kernel weight at all sites, by up to 38% at haying-off sites.
- Intervention effect Nitrogen increased harvest index at the high-rainfall site.
- Observation Harvest index decreased in crops that hayed-off.
- Intervention effect Nitrogen increased grain protein at all sites, reaching 9% to 18% at haying-off sites.
- Observation Apparent retranslocation contributed 37-39% of grain yield at the high-rainfall site.
- Observation Apparent retranslocation contributed 75-100% of grain yield at haying-off sites.
- Observation Relative to anthesis biomass, apparent retranslocation was 23-26% at the high-rainfall site.
- Observation Relative to anthesis biomass, apparent retranslocation was 24-28% in haying-off crops.
- Intervention effect By anthesis, high-nitrogen crops extracted more soil water than low-nitrogen crops.
- Intervention effect By maturity, the most severely hayed-off crop extracted 10 mm less soil water than a low-nitrogen crop.
- Intervention effect At the high rainfall site, high-nitrogen crops extracted 20 mm more soil water than controls.
- Association Haying-off was associated with reduced post-anthesis assimilation due to lack of soil water.
- Mechanism Vigorous vegetative growth stimulated by high soil nitrogen caused the water deficit.
- Mechanism Inadequate pre-anthesis reserve retranslocation failed to compensate for lost post-anthesis assimilation.