Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.
2011
Volume 14
Issue 4
Topic:
Economics
ELECTRONIC
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Kobus P. 2011. INTERVAL ESTIMATION OF ECONOMICALLY OPTIMAL NITROGEN DOSE, EJPAU 14(4), #07.
Available Online: http://www.ejpau.media.pl/volume14/issue4/abs-07.html

INTERVAL ESTIMATION OF ECONOMICALLY OPTIMAL NITROGEN DOSE

Pawe│ Kobus
Department of Agricultural Economics and International Economic Relations, Warsaw University of Life Sciences

 

ABSTRACT

The aim of this paper is to propose a procedure for interval estimate of nitrogen dose xr, which allows to achieve a chosen value of wheat production function derivative r. It is shown that the point estimator of xr follows asymptotically normal distribution. That fact is used for construction of an asymptotic confidence interval for xr. It is also shown that substituting r with proportion of input and product unit prices allows to use the proposed formula for interval estimation of economically optimal nitrogen dose. An example of such application based on winter wheat fertilizing experiment is given.

Key words: economical optimization, nonlinear regression, interval estimation.


Pawe│ Kobus
Department of Agricultural Economics and International Economic Relations, Warsaw University of Life Sciences
ul. Nowoursynowska 166, PL-02-787 Warszawa
email: pawel_kobus@sggw.pl

Responses to this article, comments are invited and should be submitted within three months of the publication of the article. If accepted for publication, they will be published in the chapter headed 'Discussions' and hyperlinked to the article.