<Table> <Tr> <Td> </Td> <Td> 960--1279 </Td> <Td> </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> 960--1279 </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="3"> Northern Song in 1111 . The largest territory of the Song dynasty at that period . </Td> </Tr> <Tr> <Td_colspan="2"> Capital </Td> <Td> Bianjing (960--1127) Jiangning (1129--1138) Lin'an (1138--1276) </Td> </Tr>

Why did chinese farming shift to the south