Abstract
In this paper, the term "storie’s index for rating soils "is used by inserting some morphological soil characteristics for rating the agriculture value of soils. Such a soil index would be useful in land classification and land evaluation, and used to express the relative ratings. Soils which show highest productive capacity (from the study of the soil under field conditions according to the specification and characterizations which obtain during the study of soil in the field and cleared within soil survey reports and maps)are rated at %100 .
The rating is based on the study four general factors (the storie index):-
A. characteristics of soil pedon; B .texture; C. slope; and X. modifying conditions (some morphological characteristics)
Characteristics listed under factor X, modifying characteristics consist of drainage conditions, fertility, stoniness, etc.….
The index is the product of rating given each of these four factors, A x B x C x X, the ratings and final index being expressed in percentages. By using this method of rating soils, we can obtain a large number of various tracts of land can be compared from the soil stand point.
According to the study we indicate that soils are varies in their productive capability and capacity. Because of absents of rules or legislation in our region for rating value of soils, there is need for some methods of comparing the relative productivity of deferent soil especially in Kurdistan region ascribed to a large number of widely divergent soil conditions.
Despite, this index (index for rating agricultural value of soil) can be use as bases for judging soils.
Key worlds: storie’s index, soil morphological characteristics, land evaluation and rating.