Running dirt throu conveiers. More dirt you get to plant, more xp you get. Plants must run all the time. Now conveiers are fast, so make distance to conveiers as short you can. Longer driveing, less dirt in conveiers and less xp. Before, conveiers was realy slow, i had conveiers running about 6 hours before getting empty, and 3-4 plants were running all the time and xp was coming. But at the moment (at least in beta version) the xp does not work. Im getting xp even doing nothing.