I have a shapefile with farms information. I know that the size of this farms is increased during last year by a certain percentage. For each row I calculate (according to farm area) the buffers radius pre- and post-growth.

So now I have two fields with the buffer radius values (that are different for each row).

How can I run a MRB according to these fields value?

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    Add a screenshot of your attribute table. What output do you want? One feature/row for each buffer? – BERA Feb 7 '20 at 14:14

Run the regular buffer tool twice and use the data in the attribute table as the buffer distance parameter. After running buffer twice you will have a pre and a post growth buffer layer. If you want the two buffer outputs in the same feature class use append or merge to combine them.

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