<Tr> <Td> Base saturation (BS%) </Td> <Td> 35 - 80% of CEC </Td> </Tr> <Tr> <Td> Manganese (Mn - I) </Td> <Td> Index> 25 </Td> </Tr> <Tr> <Td> Zinc (Zn - I) </Td> <Td> Index> 25 </Td> </Tr> <Tr> <Td> Copper (Cu - I) </Td> <Td> Index> 25 </Td> </Tr>

How long has it taken to form topsoil in canada