Claim · model-written summary
The yield-on-leaf-nitrogen regression intercepts differed markedly across experiments.
- Taxon
- Corn
Zea mays subsp. mayst0 - Outcome
- interceptse0
- Direction
- markedly differente0
- Setting
- three experimentse1
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but the intercepts were markedly different”
e1“For the three experiments the regression coefficients of yield on leaf N content were not significantly different”
t0“Corn”
Title
The Relationships among Corn Yields, Leaf Composition and Fertilizers Applied
F. G. Viets; C. E. Nelson; C. L. Crawford Soil Science Society of America Journal 1954. doi:10.2136/sssaj1954.03615995001800030017x
Other claims from this paper (17)
- Intervention effect Nitrogen alone significantly increased corn yield.
- Intervention effect Potassium application did not significantly increase corn yield.
- Intervention effect Phosphorus application did not significantly increase corn yield.
- Intervention effect Calcium nitrate was the least effective of five nitrogen sources.
- Association Leaf nitrogen before silking had lower yield correlation than leaf nitrogen at silking.
- Association Yield correlated strongly and positively with leaf nitrogen at silking.
- Association Yield correlated strongly and positively with total leaf phosphorus at silking.
- Association Leaf phosphorus and nitrogen contents were highly correlated.
- Association Leaf nitrogen was probably the dominant yield determinant in partial regression.
- Association Leaf phosphorus was sometimes important for yield.
- Association The yield-on-leaf-nitrogen regression coefficients did not differ significantly across three experiments.
- Association Yield declined 15 bushels per acre for each leaf with nitrogen deficiency symptoms at silking.
- Association The minimum symptom-free leaf nitrogen percentage appeared far below the reported critical percentage for maximum yield.
- Intervention effect Ammonium sulfate produced the highest leaf phosphorus and potassium contents versus calcium nitrate and ammonium nitrate.
- Intervention effect Ammonium sulfate produced the lowest leaf calcium and magnesium contents versus calcium nitrate and ammonium nitrate.
- Observation The sum of three leaf cations at silking tended to stay near 100 m.c. per 100 gm.
- Association Acetic-acid-soluble phosphorus was linear with and about two-thirds of total leaf phosphorus.