Claim · model-written summary
Wheat grain yield had linear, quadratic and absent responses to nitrogen across years.
- Taxon
- Wheat
Triticum aestivume0 - Treatment
- N ratese0
- Outcome
- grain yielde0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingDirectionValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Verbatim
e0“Wheat grain yield showed three distinct responses to N rates: Linear, quadratic and no response.”
Title
Kefyalew Girma; Kyle W. Freeman; Roger Teal; et al. Archives of Agronomy and Soil Science 2007. doi:10.1080/03650340701466754
Other claims from this paper (4)
- Observation Wheat responded to phosphorus only in the first two study years.
- Association Five year indicators and nitrogen accounted for most grain yield variability in the reduced model.
- Recommendation The authors caution that nutrient response experiments may not predict next-year nitrogen needs.
- Association Yearly variation in yield and fertilizer response indicated dependence on factors beyond nitrogen and phosphorus.