Abstract
The author has identified the following significant results. After parameter estimation, tests were conducted with variances from the fits, and on independent data. From these tests, it was generally concluded that exponential functions have little advantage over polynomials. Precipitation was not found to significantly affect the fits. The Robertson's triquadratic form, in general use for spring wheat, was found to show promise for winter wheat, but special techniques and care were required for its use. In most instances, equations with nonlinear effects were found to yield erratic results when utilized with daily environmental values as independent variables.
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Claims 4
Claim · model-written summary
Exponential functions offered little advantage over polynomials in model tests.
- Taxon
- winter wheat
Triticum aestivumt0 - Outcome
- little advantagee0
- Comparator
- polynomialse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exponential functions have little advantage over polynomials”
t0“winter wheat”
Claim · model-written summary
Precipitation did not significantly affect model fits.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- Precipitatione0
- Outcome
- fitse0
- Direction
- not found to significantly affecte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Precipitation was not found to significantly affect the fits”
t0“winter wheat”
Claim · model-written summary
Robertson's triquadratic form showed promise for winter wheat but required special care.
- Taxon
- winter wheatTriticum aestivume0
- Outcome
- show promisee0
- Qualifier
- special techniques and care were requirede0
- Comparator
- spring wheate0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Robertson's triquadratic form, in general use for spring wheat, was found to show promise for winter wheat, but special techniques and care were required for its use”
Claim · model-written summary
Equations with nonlinear effects often gave erratic results with daily environmental inputs.
- Taxon
- winter wheatTriticum aestivumt0
- Outcome
- erratic resultse0
- Comparator
- daily environmental valuese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In most instances, equations with nonlinear effects were found to yield erratic results when utilized with daily environmental values as independent variables”
t0“winter wheat”