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Since Saaty (1980) claimed that it is very hard for the human brain to compare more than nine elements, and that even nine is too high, all identified factors were clustered into five major factor groups: SO, Climate (CL), Economy (EC), IN, and EN (Table 3).

Table 3

Factors selected for land evaluation for IR

Factor groupsFactors
SO SL, DR, soil suitability for IR, GM, AW 
CL WD, DV 
EC FP, LU 
PM, DL 
IN DW, DN 
LC 
EN SW, UW 
Factor groupsFactors
SO SL, DR, soil suitability for IR, GM, AW 
CL WD, DV 
EC FP, LU 
PM, DL 
IN DW, DN 
LC 
EN SW, UW 

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