Estimating Uncertainty of Economically Optimum N Fertilizer Rates
Joint Authors
Gandorfer, Markus
Bachmaier, Martin
Source
International Journal of Agronomy
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-10, 10 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-03-08
Country of Publication
Egypt
No. of Pages
10
Main Subjects
Abstract EN
Nitrogen rate trials are often performed to determine the economically optimum N application rate.
For this purpose, the yield is modeled as a function of the N application.
The regression analysis is commonly used to estimate the modeled functions and the economic optimum rate, Nopt.
However, computer programs do not calculate confidence intervals for Nopt derived from quadratic yield response model or other commonly used models.
The objective was to develop a method for computing and interpreting confidence intervals for Nopt.
These confidence intervals can be estimated using an online program VINO.EXE.
For the N rate trials on the experimental field Sieblerfeld (Bavaria), confidence intervals were computed for a range of wheat and N fertilizer prices and for selected N rates for quadratic and linear plateau models.
The latter concerns the comparison with confidence intervals based upon the linear-plus-plateau yield regression model.
All intervals were found to be unexpectedly wide and their ranges were affected by N rates used in the calculations and by the choice of yield response model.
American Psychological Association (APA)
Bachmaier, Martin& Gandorfer, Markus. 2012. Estimating Uncertainty of Economically Optimum N Fertilizer Rates. International Journal of Agronomy،Vol. 2012, no. 2012, pp.1-10.
https://search.emarefa.net/detail/BIM-482378
Modern Language Association (MLA)
Bachmaier, Martin& Gandorfer, Markus. Estimating Uncertainty of Economically Optimum N Fertilizer Rates. International Journal of Agronomy No. 2012 (2012), pp.1-10.
https://search.emarefa.net/detail/BIM-482378
American Medical Association (AMA)
Bachmaier, Martin& Gandorfer, Markus. Estimating Uncertainty of Economically Optimum N Fertilizer Rates. International Journal of Agronomy. 2012. Vol. 2012, no. 2012, pp.1-10.
https://search.emarefa.net/detail/BIM-482378
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-482378