Claim · model-written summary
Slow changes in mean yield make even long series of different years from one field inaccurate to compare.
- Taxon
- Wheat
Triticum aestivume1 - Outcome
- accurately comparede0
- Comparator
- different years from the same fielde0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentSettingDirectionValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“even comparatively long series of different years from the same field cannot be accurately compared”
e1““Wheat field”
Title
Studies in crop variation. I. An examination of the yield of dressed grain from Broadbalk
R. A. Fisher The Journal of Agricultural Science 1921. doi:10.1017/s0021859600003750
Other claims from this paper (8)
- Observation Plots 2 b and 8 had slower yield decrements than plot 7.
- Intervention effect Potassium sulphate and substitutes influenced wheat yield.
- Observation All plots underwent similar slow changes in mean yield.
- Method / resource Three types of variation were distinguished.
- Method / resource Long series of average wheat yields from different fields or seasons cannot match same-field same-season plot comparisons in accuracy.
- Method / resource Neighboring plot mean yields can be compared accurately within one field.
- Observation Changes in mean yield sensibly affect average comparisons for plots 17 and 18.
- Recommendation The authors advise comparing plots 17 and 18 with other plots during high yielding periods.