lyt: Land Yield Technology
Variable
Agricultural sector
Land Yield Technology [Dmnl]
lyt = lyt + dt*( lytcr )

lyt in the updating graph: ( how to read )
In nodes
lyt : Land Yield Technology
lytcr : land yield technology change rate
Out nodes
lyf2 : land yield factor 2
lyt : Land Yield Technology
lytcr : land yield technology change rate