ly: Land Yield
Variable
Agricultural sector
Land Yield [Veg eq kg/(year*hectare)]
ly = lymt * lfert * lymc * lymap

ly in the updating graph: ( how to read )
In nodes
lfert : Land Fertility
lymap : land yield multiplier from air pollution
lymc : land yield multiplier from capital
lymt : land yield multiplier from technology
Out nodes
f : food
llmy1 : land life multiplier from land yield 1
llmy2 : land life multiplier from land yield 2
mpai : marginal productivity of agricultural inputs
mpld : marginal productivity of land development