The global carbon cycle has both marine and land components. The total amount

of C in soil organic matter (2.5 x 1012 t) amounts to 3 to 4 times the C content of the

atmosphere (7 x 1011 t). The annual input of C to the soil from the atmosphere is

approximately 1.1†x†1011 t/yr or about 15% of atmospheric CO2 (Bolin, 1983). The C

content of soils to a depth of 1†m range from 2 x 103 t/ha in histosols down to 1.2 x 102

t/ha in ferrasols (Bohn, 1976). A loss of 1% C from surface soils (0-10 cm), which can

result from agricultural activities, amounts to a loss of 12†t†C/ha.For more plz read at following article.

Regards

to calculate how much percent of carbon sequest in soil under differ cultivation practies