JAHANGARD MOHAMMADI - SOIL SCIENCE DEPARTMENT, COLLEGE OF AGRICULTURE, SHAHREKORD UNIVERSITY, SHAHREKORD, IRAN.
SYED MAHMOUD TAHERI - SCHOOL OF MATHEMATICAL SCIENCES, ISFAHAN, UNIVERSITY OF TECHNOLOGY, ISFAHAN ۸۴۱۵۶, IRAN.

Pedomodels have become a popular topic in soil science and environmentalresearch. They are predictive functions of certain soil properties based on other easily orcheaply measured properties. The common method for fitting pedomodels is to use classicalregression analysis, based on the assumptions of data crispness and deterministic relationsamong variables. In modeling natural systems such as soil system, in which the aboveassumptions are not held true, prediction is influential and we must therefore attempt toanalyze the behavior and structure of such systems more realistically. In this paper weconsider fuzzy least squares regression as a means of fitting pedomodels. The theoretical andpractical considerations are illustrated by developing some examples of real pedomodels.

Pedomodels, Pedotransfer Functions, Fuzzy Least Squares, Fuzzy regression