pal: Potentially Arable Land
Variable
Agricultural sector
Potentially Arable Land [hectare]
pal = pal + dt*(- ldr )

pal in the updating graph: ( how to read )
In nodes
ldr : land development rate
pali : initial potentially arable land
pal : Potentially Arable Land
Out nodes
dcph : development cost per hectare
pal : Potentially Arable Land