Of course the land has to be managed like this for ever otherwise the carbon will not stay..

Here is a paper with some numbers:
https://www.researchgate.net/publication/221899778_Soil_Organic_Carbon_Sequestration_Rates_by_Tillage_and_Crop_Rotation_A_Global_Data_Analysis

Seems quite hard to measure at the moment here is an introduction by the Food and Agriculture ogranization of the United Nations

http://www.fao.org/3/a-
i6937e.pdf

#regenerativeagriculture #regenerativecultures