lfdr: Land Fertility Degredation Rate
Variable
Agricultural sector
Land Fertility Degredation Rate [1/year]
lfdr = tabhl ( lfdrt , ppolx , 0, 30, 10)

lfdr in the updating graph: ( how to read )
In nodes
lfdrt : land fertility degredation rate table
ppolx : persistent pollution index
Out nodes
lfd : land fertility degredation
tabhl
