lfrt: Land Fertility Regeneration Time
Variable
Agricultural sector
Land Fertility Regeneration Time [year]
lfrt = tabhl ( lfrtt , falm , 0, 0.10, 0.02)

lfrt in the updating graph: ( how to read )
In nodes
falm : fraction of agricultural inputs for land maintenance
lfrtt : land fertility regeneration time table
Out nodes
lfr : land fertility regeneration
tabhl
