Discussion on fuzzy assessment system based comprehensive method for evaluation of fertility grade of slope soil

A comprehensive fuzzy assessment system for fertility grade is established for Shuibuya Region in Hubei Province;i.e.establishing the membership function through the way of determing single factor from the more mature method of standard comprehensive assessment on fertility grade,and then defining its weight with the changes of the interval measured values of all the fertility factors,furthermore,giving the soil fertility a certain comprehensive index with the established fuzzy assessment system;from which the result is more coincided with that from the method of standard comprehensive assessment on fertility grade.Generally,with the result from the study herein,the fertility distribution of different grades with the changing trends of the comprehensive grade index values under all the relevant temporal states can be more obviously obtained.